The most important: there're many rooms in this appartment, and they might be shared with other guests you don't know. Also the toilet and the living room with coaches will be shared with the other guests. The rooms were pretty small, not all equipped with essential furniture (like wardrobe - we only had one per 3 rooms, so not all of us could use it). At the time we have arrived, the door locker in our room was broken - given other inhabitants - that didn't give a safety feeling. The kitchen is only equipped with 1 frying pan and a kettle, you cannot really cook a lot (though enough for fried eggs). Coming with an infant is not the best idea - there's no extra place for the baby cot.
The good thing: appartment is 5 minutes walking distance from Manneken pis. Also, the hosts are friendly people - we've got a breakfast from them and a plate of fresh fruits, lovely.