We stayed with four people for a long weekend. It's a bit small for four, but good for short periods of time, or if you'll be gone most of the day.
Airbnb's photos are accurate. It's a nice apartment. Nice bathroom, and a cute little garden! The kitchen is well equipped. (There is not enough warm water for four people to take a shower!)
Vincent is fast and clear with communication online, but in person things were a bit weird. We found out on the spot (by calling him) that he was in the US, and we were let into the apartment by his mother. She accommodated us well and was very kind.
The location is great, just a short walk from the metro station, and in a very nice neighbourhood. The supermarket is right next door, and there are plenty of restaurants around the corner.
Take note: the location that airbnb indicates on the map is on the wrong street! We walked the wrong way from the metro station at first because of this.