We just had a great time in Brussels. The apartment is great, small but has everything we need, good bedroom with a doublebed, great bathroom, kitchen with everything we need. I would sugeest just a sofa-bed in the room, for the third person (the campaing-bed is not so confortable, but it is ok if you gonna stay for only a few days).
It is located in a residencial neighborhood, 2 blocks from Botanique Metro, walking distance from rue de Nueve e the city center.
Thnx Mariano!!!