Connecting to city center , you have a train every 15 minutes, some direct to Brussels North station, Brussels Central and Brussels Midi (south) station.
shedules see
http://plannerint.b-rail.be/bin/query.exe/en?L=b-rail
example : Brussels airport - Brussels Central
http://plannerint.b-rail.be/bin/quer...93578&OK#focus
and avoid most of the Brussels Rue de Bouchers restaurants, there is much better than these ..