Lara's flat is incredibly convenient to public transit and to really good shopping areas. It's in an exceptionally safe feeling area as well. The couch doesn't pull out, but it actually sleeps better because of that, because it doesn't have a metal bar in your spine. It's the size of a twin bed. The bedroom bed is great and the room is big. The bathroom has good fixtures and good pressure on the shower head. The kitchen is fully outfitted and has a clothes washer/dryer that is a typically small Euro model, but if you jump the timing on the dryer up, it gets a small load reasonably dry. She has wifi that works well.
There's an elevator, which is great. It stops hard when it gets to your floor though :)
All in all, an outstanding basecamp for having fun in Brussels, and it's only 3 subway stops from Brussels Midi station, so it's great for going to other places if you want.