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.

All kick-off times shown are local time (CET).
 

MATCHDAY 1: 15 June, Italy vs Albania

Kick-off: 21:00
Venue: Dortmund
Stay: Hotels Hostels Campsites Holiday homes

Hotel suggestions:

Mercure Hotel Dortmund City
Have stayed here several times before safe standing meetings / games at the Westfalenstadion. Just round the corner from the main station and directly beside Kampfstrasse underground station, from which you can go straight to the ground.

Express by Holiday Inn 
“Clean and functional” says Crewe fan Ian.

Mercure Hotel Dortmund Messe & Kongress
You couldn't get closer to the stadium! Just walk across the gardens outside the hotel's front door and your outside the stadium. 4-star hotel. Free parking and Wi-Fi. Underground station for trains into the city centre 50 metres away.

Hostel suggestions:

DJH Jugendgästehaus Adolph Kolping
As I said above, it's been many years since I was a backpacker staying in hostels, so I can't say I've stayed here myself, but this DJH (German Youth Hostel Association) place is well situated, being just 800m from the main station, right next to one of the big squares in the pedestrianised city centre.

a&o Dortmund Hauptbahnhof
Budget hotel rooms and beds in dorms on offer. Situated less than 200m from the main entrance to the main station (and thus also only 300m from the FlixBus coach station). 24-hour reception. Free Wi-Fi.

The Bunk Hostel
Located in Essen, but right by the main station, so you can be at Dortmund main station in 25 minutes. New, modern hostel. Rated 'Fabulous' on Hostelworld. Free Wi-Fi.

Campsite suggestions:

Camping Hohensyburg
850m walk to Syburg bus stop, then bus and underground via Dortmund-Hörde to Dortmund main station. Total journey time: 57 minutes.

Knaus Campingpark Essen-Werden
1000m walk to Essen Werdener Markt bus stop, then an 18-minute bus ride to Essen main station and 22 minutes on a regional express train to Dortmund. See Deutsche Bahn website for train times and tickets.

Holiday home suggestions:

Countryside apartment just 7km from the city centre
Situated in the countryside district of Eving, this spacious modern apartment is nevertheless under 10 minutes by car from central Dortmund. 2 bedrooms. Modern kitchen appliances. Smart TV. Free Wi-Fi.

Large apartment with garden
Located in a suburb of Bochum, but less than 20 minutes by car from the stadium in Dortmund (and only a couple of minutes more to the Arena AufSchalke in Gelsenkirchen). Well appointed, large apartment with garden. Quiet location. Sleeps 5. Terrace.

Bright, modern apartment south of Dortmund
Located in Schwerte, to the south of Dortmund. Sleeps 6. Two bathrooms. Spacious layout. Bus stop almost outside the front door. 20 minutes by car into central Dortmund.Free Wi-Fi. 

Alternative locations:

Dortmund rates too high? Try Bochum instead (10 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 Dortmund to Hamburg times and fares (for train times and fares between all host cities see my 'Train times' page).

MATCHDAY 2: 19 June, Croatia vs Albania

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

Hotel suggestions:

Lindner Hotel am Michel
Union Berlin fan Felix says he "really liked" this 4-star hotel in central Hamburg. A 10-minute walk from the harbour, the Reeperbahn and public transport, via which you can reach the stadium in around 40 minutes.

Motel One Hamburg-Fleetinsel
A lower budget tip from Felix's other half, Natasha, this hotel is 11 minutes by public transport from the main station, 13 from the Reeperbahn and c. 45 from the stadium.

Mercure Hotel Hamburg am Volkspark
A 20-minute walk across the park to the stadium. 4-star hotel. Restaurant and bar. 24-hour front desk. Free WiFi. 

Hostel suggestions:

Backpackers St. Pauli
The last time I was in Hamburg and potentially in the market for a hostel bed, my mates and I were so skint that we instead hopped on a train with our Interrail passes (it was that long ago!) and pulled out the seats of an old 6-seat compartment to make beds for ourselves there. For those in seach of a hostel during the Euros, however, this place looks a fair option. It's 25 minutes by bus from the main station in the St. Pauli district of Hamburg. It offers dormitory accommodation and has a bar.

Arena Hostel
Simple accommodation for travellers and tradesmen. A 15-minute walk from the stadium and about 30 minutes by S-Bahn suburban train to the main station. Double and quadruple rooms, and 4-bed and 6-bed dormintories. Free parking and Wi-Fi.

a&o Hamburg City
A 5-minute walk from/to the main station (and thus also the adjacent FlixBus coach station). Modern single, double and family rooms, plus 4- to 8-bed dorms. 24-hr reception, Free Wi-Fi. Lobby bar.

Campsite suggestions:

KNAUS Campingpark Hamburg
45 mins with U-Bahn and bus to Hamburg main station and 56 minutes (one bus) to the stadium.

Camping ABC am Großensee/Hamburg
500m to Großensee, Hamburger Straße bus stop, then the bus to Rahlstedt Bahnhof (station) and a regional train to Hamburg Hauptbahnhof. Total journey time: 55 minutes. See Deutsche Bahn website for train times and tickets.

Holiday home suggestions:

Ferienwohnung Haus Gartenlust
Holiday apartment with garden, barbecue and sauna. Two bedrooms. Sleeps 5. In the Jork area of Lower Saxony, west of Hamburg. 35 minutes by car to the stadium.

Holiday apartment in Norderstedt
Locaed to the north of Hamburg, this holiday apartment in a quiet sidestreet is a 21-minute drive from the stadium. Two bedrooms. Sleeps 4. Balcony. Free Wi-Fi.

Modern apartment in Halstenbeck
Located just to the north of Hamburg and only an 11-minute drive from the stadium, this two-bedroom apartment sleeips 5. Modern funishings and design. Balcony. Free Wi-Fi. Awarded 5 stars by the German Tourist Association (DTV).

Alternative locations:

Hamburg rates too high? Try Lübeck instead (44 minutes away; NOT covered by a match ticket).
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 Hamburg to Düsseldorf times and fares (for train times and fares between all host cities see my 'Train times' page).

MATCHDAY 3: 24 June, Albania vs Spain

Kick-off: 21:00
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.

Group-stage base:

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