The studio apartment was easy to find. Despite never seeing Serenia, the check-in and out went smoothly and her indications have been helpful and precise.
The apartment was clean, sheets, towels and internet were provided and it worked fine for my stay, however, the place where I stayed is not the one in the pictures. It took me a while to realise because it was very similar: same kitchnette, same tiles in the bathroom. The studio where I stayed is in fact a little bigger than the ones in the pictures, which is obviously something I wouldn't complain about. The only disappointing thing was the bed, which was in fact a bed couch and not a bed like I expected. Since I stayed in Brussels for a whole week for working reasons, my main use of the apartment was sleeping, so I would have strongly preferred a real bed, supposedly more comfortable.
In conclusion I recommend staying at Serenia's apartment, however it is appreciable to see more accurate pictures before booking.