We found Stefan's apartment to be the perfect base for our stay in Brussels, and Stefan himself to be a friendly, personable host. As previously arranged, we arrived from Eurostar while Stefan was still getting the flat ready after the previous guest, but he happily allowed us to drop off our luggage and gave us a tour before we set out for the day and left him to it.
The flat itself is beautiful, with lots of natural light coming in through the huge windows at the front and back (all well soundproofed). Perhaps the most impressive feature is the bathroom, leading down some steps from the bedroom (almost like descending into a Roman bath) and making clever and inventive use of space (the bath itself is huge, I almost got lost in it). In the kitchen, we particularly enjoyed the funky coffee machine! (for which Stefan very kindly provided the coffee).
Communication with Stefan and Hans was great. They live onsite, but were very discreet and we were hardly aware of their presence (although they were easily reached on the few occasions we needed to contact them). Hans even granted us the inaugural use of his iron!
Although situated at the western edge of Brussels' Lower Town, the apartment could hardly be better placed for getting to the city centre. A short walk along Rue des Fabriques brings you to the Halles St. Gery area, which is positively popping with bars and cafes. From there you cross over Boulevard Anspach and you're at the Grand Place. For getting further afield, there's a tram stop adjacent to Place de Ninove, or the Metro at Bourse- we used both. Gare du Midi is only a 7 minute ride away by the 51 tram, and from there you can easily get by bus, tram or metro to all other parts of the city. Gare du Midi is also well placed for getting to places outside of Brussels. Trains go through the city to the other stations (Centrale, du Nord, etc), so there's no particular advantage in going to any of them when you can easily go to du Midi. We had two day-trips, one to the Herge Museum at Louvain La Neuve, the other to Antwerp, and had no difficulties either time (try to go on Saturday or Sunday, though, when there's 50% off).
We found Delhaize Proxy, less than 5 minutes' walk along Rue des Fabriques, more than adequate for our everyday grocery needs.
So, all in all, great hosts, great flat, great location and great amenities, and we would have no hesitation in recommending it to other Airbnb users who are thinking of coming to the vibrant, historic, modern, beautiful city of Brussels.