Well-designed and great location, highly recommend! We also stayed at a nice hotel in the heart of the marais earlier in our trip (we had credit from a cancelled previous trip from 2020) and honestly, while the hotel was very nice, we enjoyed our stay at Frédéric's place more. There are so many thoughtful touches and artistic items, it really feels like staying in a home. We visited in early April so AC was not a problem, though I can imagine it getting stuffy in the summer. The area (near the canal st. martin) is close to so many things and I've heard it's the place to live as a local since the heart of the Marais can get quite touristy and expensive. What a wonderful stay, I hope to come back in the future.