We have set aside a number of rooms on a first-come first-serve basis in the conference hotel Park Plaza Victoria Amsterdam. The rates include breakfast but not the 5% stadsbelasting. Note that most of the online rates are without breakfast and that only the night from Sunday to Monday could be cheaper alone. Deadline for getting these rates is May 29.
We have:

• 165 Euro single
• 180 Euro double

Additionally, we have set aside a number of rooms on a first-come first-serve basis at two smaller Hotels.

Hotel Terminus For the moment our reservation for the Hotel Terminus is keeping the rooms only till April 27th. We are trying to extend this but please act fast. Deadline for getting these rates is May 15.
We have:

• 77 EUR single (shower)
• 85 EUR single (bath)
• 116 EUR double (single use, bath)
• 126 EUR double (double use, bath)

Old Quarter The Old Quarter is a cheap alternative. Please be aware that it comes with shared facilities on the corridor. Deadline for getting these rates is May 28.
We have:

• 45 EUR single
• 75 EUR double

For alternative accommodation we refer to the official Amsterdam webpage: Amsterdam tourism where you can find information about hotels and guest houses of all categories. The conference hotel is situated directly opposite the central station. There are several hotels and hostels around (and places that rent rooms on an hourly basis, too).