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Group accomodation in Brussels?
Have you tried this one? It's a bit far out from attractions, but near Herman-Debroux metro on line 5, less than 30 minutes to the city centre.
http://www.auberge3fontaines.be/fr/
This one is self-catering I think, usually used for school residentials, might be empty in December.
http://www.parcparmentier.be/location.html