I finally got into booking the Nikko for myself (227 DEM weekend rate), Steigenberger is apparently booked on Friday night and the Hilton website didn't have any availability either.
I've updated the web-page to include a column with contact information (thanks to transpac's comment). The suggestion is to publish mobile numbers, if people want to coordinate using SMS of calling their buddies directly.

[This message has been edited by Mizu (edited 10-26-2000).]