The apartment is small yet with high ceilings and is very well planned. The host considered the smallest details (like a small shelf, lighting, and inner electrical socket in the Murphy bed), which make it especially comfortable. The location was so fabulous you could hear the music from the festival (I came in December for the Fête des Lumières, the festival of lights).
One small glitch was the check in. Apparently the address is not the exact address of the apartment (I am told French maps are often a bit off and this is not unusual). Unfortunately Guillaume was waiting for me on the street, while my flight was delayed when I was already boarded on the plane and with no Internet connection so I couldn't inform him. Upon arrival (again, me being late) Guillaume was not waiting for me any longer. Though I was the one being late, I feel this could've been handled better.