We had a lovely experience staying at Thomas's flat. He communicated well prior to us coming and we were pleasantly surprised to find a bottle of champagne in the fridge welcoming us to Paris.
The flat is a tough 4 flights walk up so be prepared to travel light unless you want to make a few trips for luggage. We had a stroller with us which we had to carry up and down the stairs. Thomas was lovely enough to provide a baby for for our child but he apartment is not particularly child friendly, as toddlers can easily fall down the stairs on the main level (there is a staircase to walk up from the front door). We barricaded the stairs with chairs and avoided this problem. The apartment is also decorated with lovely treasures from around the world but all unfortunately at toddler height. We had to move several items so my daughter would not play with them.
Overall a FANTASTIC apartment for adults and older children but not so much for toddlers.