The apartment is really spacious and cozy, absolutely very comfortable, with one really big sleeping room and a second one a bit smaller but very nice too. The building itself is not the most beautiful and the street, Chaussé de Wavre, is noisy and dirty, but literally behind the corner there is one of the nicest areas in Brussels, and it is a very comfortable location for public transport.
One more thing: Nadeem has been a fantastic host, incredibly kind and available, absolutely recommend. Make sure to be in phone contact through though!