When we came to O's place everything looked fine but one thing, the 4th bed. Apparently, it was a wall mounted bed meant for kids. The ladder wasn't securely attached to the wall (very insecure), and the wall mounted bed didn't look very sturdy either. Anyway, we put a mattress from the king-size person bed on the floor in the living room.
Unfortunately, we had a GAS LEAK because the gas pipe was not securely attached to the boiler too. We tried calling O because like she said, she was available in an emergency. Unfortunately, O was not reachable at that time and I had to figure out myself how everything worked in Brussels. We immediately called the gas authority of Brussels (Sibelga).
After about an hour to an hour and a half, she called me back and naturally immediately came to the apartment.
The apartment was clean but the facilities offered are for maximum two adults and three kids (watch out, 3rd bed was not safe). O couldn't do anything about the gas leak, but we would have liked if she was better reachable.