Enjoy the neighborhoud of Brussels, Forest, 15 minutes away from the city center with bus or tram. (tram and bus stop in front of the appartment)
Also a lot of nice bars and restaurant closer by at walking distance. (center of Saint-Gilles is 5 minutes by foot)
You can also just get lost and enjoy the big parc (Parc Forest and Parc Duden) in front of the appartment.