Book bindery

Where in Brussels? For which level of quality?

I could recommend Reliure Artisanale on Rue Africaine 19 in Ixelles, but it's not going to be cheap :)

You could also try one of these:

http://www.pagesdor.be/relieurs-brocheurs/bruxelles-1120/

Beschermde Werkplaats (protected workplace, for people who are handicapped or have other problems that do not allow them to have a normal job) often do bookbinding, at a good price. Perhaps the one in Zaventem: http://www.dymka.be/papier.html
the one in Vilvoorde does not specify what they do: http://www.mivavil.be/index.html
If you don't mind going a bit further: http://www.ryhove.be/nl/home, which is in Gent.
YOu can google more options: beschutte werkplaats boekbinderij - or - beschermde werkplaats boekbinderij.