Matchday dates
Listed below are the group-stage matchdays by date, plus accommodation booking links and suggestions for each game.

Alternative options:
In case the host city rates are already too high for you, I've also listed an out of town option that you could try. In each case there is a direct rail link. The times I've shown are from main station to main station using local or regional services, not express trains that are excluded by some rail passes like the Deutschlandticket. If you have an Interrail pass, however, you can use express trains, so could reach the out-of-town locations faster.
 

MATCHDAY 1: 17 June, Belgium vs Slovakia

Kick-off: 18:00
Venue: Frankfurt
Stay: Hotels Hostels Campsites Holiday homes

Hotel suggestions:

Flemings Hotel Frankfurt Central 
Stayed in by Liverpool and Union fan John for an Union away game against Eintracht a few seasons ago. Described by him as “OK” and picked largely due to its location: directly opposite the main station (and thus also the adjacent FlixBus coach station).

Adina Apartment Hotel
A tip from another Union fan, Felix, this centrally located 4-star hotel is just an 11-minute walk from the main station and about the same to the Römerberg. By public transport it's just over half an hour to the stadium.

Lindner Hotel Frankfurt Sportpark
(Part of JdV by Hyatt). Directly across the road from the stadium. 3-star hotel. Modern design. 24-hour front desk. Restaurant and bar. Free Wi-Fi. 11 minutes on foot to the Stadium S-Bahn (suburban train) station, from which the airport is a 5-minute journey and Frankfurt main station a 9-minute ride.

Hostel suggestions:

Five Elements Hostel Frankfurt
If you don't mind being in the red light district, this inexpensive hostel is handily located only 200m from the main station. 24-hour reception and breakfast buffet served up until noon.

a&o Frankfurt Galluswarte
A 20-minute walk or just one stop on the S-Bahn (metro) to Frankfurt main station (and thus the adjacent FlixBus coach station). Single, double and shared rooms. 24-hour reception. Rooftop bar.

a&o Frankfurt Ostend
Located, as the name suggest, in the east end of Frankfurt, this hostel is a 24-minute tram ride from the main station. Designed in a&o's 'next generation' style, it offers single, double, family and shared rooms. 24-hr reception. Free Wi-Fi.

Campsite suggestions:

Campingplatz Maaraue
Near Mainz. From the campsite it's 1000m to Wiesbaden-Mainz-Kastel station, then 26 minutes on the train to Frankfurt Hauptbahnhof. See Deutsche Bahn website for train times and tickets.

Campingplatz Mainkur
1400m to Frankfurt Mainkur Bahnhof (station), then a 31-minute journey to Frankfurt main station.  See Deutsche Bahn website for train times and tickets.

Holiday home suggestions:

Cozy apartment in the heart of Frankfurt
Newly renovated apartment with two bedrooms and a living room that can also be used as a bedroom. Located in Frankfurt am Main Süd, adjacent to the Sachensen cider tavern district. 10 minutes by car to the stadium. Frankfurt Lokal metro station nearby.

Lovely apartment in Brentanopark
Located to the northwest of Frankfurt city centre, this apartment in Brentanopark has two bedrooms and sleeps four. In some designated areas, smoking is allowed. 20 minutes by car to the stadium or 45 minutes by metro and tram. Rödelheim metro station is a 10-minute walk away.

Zum Kelterhaus, Ober-Hilbersheim
If you can read German, then I can personally recommend this place, as I made it my base for the 2006 World Cup. Lovely farmyard-style apartment over two floors in a sleepy village around 45 minutes' drive out of Frankfurt.

Alternative locations:

Frankfurt rates too high? Try Darmstadt instead (17 minutes away).
For other options, all within the match ticket 36-hour free travel area, see my Transport networks page.
 

Travelling to match 2 by train? Here are the Frankfurt to Düsseldorf times and fares (for train times and fares between all host cities see my 'Train times' page).

MATCHDAY 2: 21 June, Slovakia vs Play-off winner B

Kick-off: 15:00
Venue: Düsseldorf
Stay: Hotels Hostels Campsites Holiday homes

Hotel suggestions:

Ibis Düsseldorf Hauptbahnhof 
Stayed here for a Union game a couple of years ago. You know what you’re getting with an Ibis hotel, and this one couldn’t be handier if you’re travelling by train or coach, as it’s built into the main station and thus next door to the FlixBus coach station..

Best Western Ambassador Hotel
Only 200 metres from the main station. 24-hour reception. Not a hotel I've stayed at myself, but almost as handy for trains in and out of town as the Ibis above.

Hostel suggestions:

Backpackers Düsseldorf
An inexpensive hostel for those doing the Euros backpacker-style. A 15-minute walk from the bars of the old town.

a&o Düsseldorf Hauptbahnhof
A 14-minutes walk from the main station (and thus also from the adjacent FlixBus coach station). Opened in 2009, the hostel offers modern rooms in a range of categories, plus a large lobby and bar.

City Youth Hostel Düsseldorf
Located on the far side of the Rhine from the city centre. 18 minutes by public transport or a 30-minute walk to the old town.From single rooms to dormitories. 

Campsite suggestions:

Camping Düsseldorf-Lörick
1500m walk to D-Lörick underground station, then 16 minutes on the underground to Düsseldorf main station.

Camping Zweckverband Unterbacher See
850m walk to D-Stammesberg bus stop, then a 7-minute bus ride to Düsseldorf-Gerresheim and 5 minutes on the S-Bahn (metro) to Düsseldorf main station.

Holiday home suggestions:

Holiday apartment in Neuss
Two-bedroom apartment with modern furniture, located in Neuss, less than 20 minutes by car from both Düsseldorf city centre and the Merkur Spiel-Arena. Sleeps 4. A 3-minute walk to the nearest underground station, from where it's a direct 20-minute ride to Düsseldorf main station.

Modern apartment in Grevenbroich
Suitable as a base for both Düsseldorf and Cologne, as it's 24 minutes by car to Düsseldorf city centre and 33 to Cologne. Sleeps 4. Modern design and furnishings. Rated 'Exceptional' by 35 reviewers at time of writing.

Dorm-style accommodation in Kaarst
Sleeps up to 15. Can be hired in its entirety or partially. Facilities shared by all house guests. A 20-minute drive to the stadium.

Alternative locations:

Düsseldorf rates too high? Try Wuppertal instead (18 minutes away)
For other options, all within the match ticket 36-hour free travel area, see my Transport networks page.
  

Travelling to match 3 by train? Here are the Düsseldorf to Frankfurt times and fares (for train times and fares between all host cities see my 'Train times' page).

MATCHDAY 3: 26 June, Slovakia vs Romania

Kick-off: 18:00
Venue: Frankfurt
Stay: Hotels Hostels Campsites Holiday homes

Hotel suggestions:

Flemings Hotel Frankfurt Central 
Stayed in by Liverpool and Union fan John for an Union away game against Eintracht a few seasons ago. Described by him as “OK” and picked largely due to its location: directly opposite the main station (and thus also the adjacent FlixBus coach station).

Adina Apartment Hotel
A tip from another Union fan, Felix, this centrally located 4-star hotel is just an 11-minute walk from the main station and about the same to the Römerberg. By public transport it's just over half an hour to the stadium.

Lindner Hotel Frankfurt Sportpark
(Part of JdV by Hyatt). Directly across the road from the stadium. 3-star hotel. Modern design. 24-hour front desk. Restaurant and bar. Free Wi-Fi. 11 minutes on foot to the Stadium S-Bahn (suburban train) station, from which the airport is a 5-minute journey and Frankfurt main station a 9-minute ride.

Hostel suggestions:

Five Elements Hostel Frankfurt
If you don't mind being in the red light district, this inexpensive hostel is handily located only 200m from the main station. 24-hour reception and breakfast buffet served up until noon.

a&o Frankfurt Galluswarte
A 20-minute walk or just one stop on the S-Bahn (metro) to Frankfurt main station (and thus the adjacent FlixBus coach station). Single, double and shared rooms. 24-hour reception. Rooftop bar.

a&o Frankfurt Ostend
Located, as the name suggest, in the east end of Frankfurt, this hostel is a 24-minute tram ride from the main station. Designed in a&o's 'next generation' style, it offers single, double, family and shared rooms. 24-hr reception. Free Wi-Fi.

Campsite suggestions:

Campingplatz Maaraue
Near Mainz. From the campsite it's 1000m to Wiesbaden-Mainz-Kastel station, then 26 minutes on the train to Frankfurt Hauptbahnhof. See Deutsche Bahn website for train times and tickets.

Campingplatz Mainkur
1400m to Frankfurt Mainkur Bahnhof (station), then a 31-minute journey to Frankfurt main station.  See Deutsche Bahn website for train times and tickets.

Holiday home suggestions:

Cozy apartment in the heart of Frankfurt
Newly renovated apartment with two bedrooms and a living room that can also be used as a bedroom. Located in Frankfurt am Main Süd, adjacent to the Sachensen cider tavern district. 10 minutes by car to the stadium. Frankfurt Lokal metro station nearby.

Lovely apartment in Brentanopark
Located to the northwest of Frankfurt city centre, this apartment in Brentanopark has two bedrooms and sleeps four. In some designated areas, smoking is allowed. 20 minutes by car to the stadium or 45 minutes by metro and tram. Rödelheim metro station is a 10-minute walk away.

Zum Kelterhaus, Ober-Hilbersheim
If you can read German, then I can personally recommend this place, as I made it my base for the 2006 World Cup. Lovely farmyard-style apartment over two floors in a sleepy village around 45 minutes' drive out of Frankfurt.

Alternative locations:

Frankfurt rates too high? Try Darmstadt instead (17 minutes away).
For other options, all within the match ticket 36-hour free travel area, see my Transport networks page.

Group-stage base:

For a potential group-stage base away from the host cities, see my Group D Base page.