We stayed 4 nights in Marie-Pierre's flat and had a great stay. It is very comfortable, clean and new with all amenities for cooking and a washer for laundry. Good location with 3 grocers nearby and close to Metro and lots of cafes and restaurants.
I would not recommend this flat for people with a lot of luggage or with mobility problems as there are three flights of stairs to tackle to get to the flat, although not an issue for us, worth noting for others :)
My only suggestion would be that it would be nice to have a pedestal fan or something in the flat as it was very hot on one of the days and this would have been greatly appreciated to help cool down!