Hotels

For those still looking for a place to stay, I will list some hotels below. They are situated near the party place, or easy reachable by public transport. I talked to the hotel managers and they are willing to give us a discount (up to 10 euro/night) when we book multiple rooms. If one of the following suggestions sounds interesting to you, please let me know asap.
But of course don't feel obliged to arrange your accommodation this way,there are plenty other hotels in the city which you can choose.

Stayokay hostels

+ relatively cheap (+- 35 euro/night/per person, breakfast included)
+ nice area (situated in the famous Vondelpark in the centre of A'dam)
- no private room
- no direct tram line (you need to take at least 2 trams to get there
www.stayokay.com

Victorie hotel (**)

+ 10 min walking from the party place (or a few tram stops, direct line)
+ reasonable price (80 euro/night/double room, breakfast included)
- small rooms (basic accommodation)
- it takes +- 20 minutes to get to leidseplein (=city centre)
www.hotelvictorie.nl

Hotel Sarphati (**)

+ cosy, small hotel in front of Sarphatipark (Pijp area)
+ easy to reach (tram 25)
+ family rooms
- only a few rooms available
- price (120 euro/night/double room; 170 euro/night/family room, breakfast incl)
www.sarphatihotel.com

Aalborg Hotel (***)

+ price (85 euro/night/double room; 129 euro/night/family room)
+ easy to reach (tram 25)
+ nice area (sarphatipark)
- breakfast not included (9 euro p.p; 7 euro for children up to 10 y.)
www.aalborg.nl

Novotel (****)

+ a lot of facilities
+ nice rooms
+ reasonable price (+- 130 euro/night/double room)
- reachable, though you should count on 2x10 min walking (and 15 min metro)
- situated 4km from the city centre
www.novotel.com

Hotel Savoy (****)

+ nice rooms
+ easy to reach (tram 25)
+ family rooms (4 persons)
- rather expensive (+- 150 euro/night/double room, breakfast included)
www.savoyhotel.nl