I stayed for four moths at the flat. It is a great apartment, very tidy and very nicely decorated and well equipped. Cecilia and Maxim are very nice, helpful and respond within a few minutes if there is any question. The flat is also very good located, just 3 minutes walk from the European Parliament and train station Brussels-Luxemburg in a nice area with a supermarket, the famous Mansion Antoine (frites) and the Park Leopold close by. The city centre is also in walking distance (about 20-25 Minutes).
All in all, I enjoyed my stay at the flat very much and highly recommend it to everyone!