Pearl’s place is situated almost in the middle of Brussels main train lines-Midi and Central which would require you 12-18mins walking time. It is also about 10mins away from the Brussels square too.
The flat has enough rooms if you are accommodating to 6pax but there’s only one toilet/bath which would require your group to organize time of usage. Their flat is also situated on the first floor which would require about 40steps to reach the door.