Had a decent stay at Antoine's place. A few comments from our stay:
The location is fantastic, and just a few minutes walk from most places in central Brussels. The apartment itself is homely, with nice decor and furnishings. It was also well equipped, with dishwasher, cable/smart TV and coffee machine (with some coffee provided). The internet, whilst fairly fast, was patchy at times. There is a lift, so having to navigate the spiral stairs up to the apartment is not a problem. The apartment came with one set of keys (although we didn't happen to ask if there were more)
Being centrally located (even though it's fairly high up, on the 4th floor), there is regular noise from the street below, which was noisy in the evenings as we had the windows open in hot weather. The mosquito nets on each window were a nice touch.
Communication with Antoine was great, and he responded to our messages very quickly at all times. Check in, and check out were smooth, and we were able to leave our bags with one of Antoine's colleagues which was extremely helpful.
All in all, enjoyed our stay, would stay again.
PS. The flat had cool bathroom ducks.