Lovely hotel, with a small but well appointed room. The air conditioning was a godsend in the July heat. Excellent position close to many restaurants and bars in a residential part of Paris. Little cakes at reception and a free bottle of wine with our stay were also nice touches. Would definitely recommend overall.
The gym was nice, you book a 45 min slot which includes the sauna and a large rainforest style shower. I cannot fault the sauna and shower, however the gym was a little style over substance with expensive but minimally usable equipment. If you are booking for a spa, go ahead, if you are expecting a fully kitted gym you can use at your leisure, consider somewhere else.