But honestly, you should be careful cos there are really some areas in Brussels when you can get killed easily, before getting a room talk to someboy from here. Schaerbeek is OK before the Chaussee de Louvain, avoid what is behind it.
Avoid Sint-Jost-ten-Noode
Avoid what is behind the Kanaal, I've never been there, but since I heard many stories I don't feel like going there at all.
Be careful about Matonge (part of Ixelles)