We can recommend the hotel Aris as an excellent choice. You can book this hotel using this reservation form. I would however suggest you to check this hotel first through this link. Possibly (depending on availability), you can book your room even cheaper this way, instead of using the reservation form.
Also the Leuven area is a possibility, since there is a regular and fast railway connection with Brussels. This trip takes approximately 32 minutes. Information on stays in Leuven can be found here.
Additionally, some student rooms (with own sanitary facilities) will be available in Leuven at the price of approximately 30 EUR (without breakfast). For more information concerning these student rooms, please contact Franki Dillen before January 15th, 2007.