Everything was perfect. The room is nice and clean, the bed very comfortable.
The flat is not in the center but there are a lot of bus stops close to the building so you can arrive everywhere. Nathalie is a perfect host. She's super nice, discreet and very helpful. The check-in was at 7pm but, since I arrived in Brussels in the morning, she allowed me to do it earlier.
I loved to stay at Nathalie's flat and I really recommend it!