This is a really smart flat for a break in Brussels. It's right by the Parc de Bruxelles, and walking distance to the EU district (about 15 minutes) or the Grand Place (20 minutes). Its also very close to the Arts-Loi station which makes getting around very easy.
The apartment is spacious, clean and has an air of calm. My 6 and 4 year old stayed in the bunk beds (the top bunk is very high so wouldn't recommend for children <6). I'm not normally happy when a double bed is just two pushed together, but these mattresses were very comfortable and it didn't feel like there was a ridge in the middle.
The shower had decent power, the towels were soft. The kitchen had what you'd need for a short stay. The bottle of wine and bottle of water were a nice touch.