Minor remarks : pillows are a bit too small.
It would be good to have another "floor towel", to put outside the shower, when the floor gets wet. The toilet door should have sound softeners, because it was banging loud when shutting. Too bad the wifi connection is not constant, and it disconnects you automatically every few minutes of inactivity (you can't get email alerts in that case).
Modern and clean rooms, good bed and sufficient facilities for this type of budget.
It was very quiet (in early September). I recommend it for a couple, since the shower door directly leads to the bedroom... And for people with a car, since it's not so close to public transport (unless you don't have heavy luggage and don't mind walking). Not far from a big commercial centre. If you plan to visit the centre of Brussels, you can't walk there but it's fairly close to the Stalle tramway station (line 4), which has a big free parking, and reaches the centre in about half an hour.
I definitely would come back next time I go to Brussels.