Great place. The flat itself is surprisingly large, with a decent-sized living room, a bedroom with a double bed, table and room to leave your suitcase on the floor, a decent kitchen, and a small but completely sufficient bathroom. The location is also great - lots to do within walking distance, and two stations very nearby if you want a quicker/less tiring trip around Paris.
The flat was clean and tidy and communication with Claude was very easy and pleasant.