This is a lovely, quiet, sunny studio. You can tell it was designed with care. Both the bed and the sofa bed are comfortable, and there are comfortable pillows. The windows in the main room and bathroom overlook a courtyard and it was fun to have a shower with a view.
Jean-Christophe is friendly and very quick to answer questions. We had a late plane and he let us stay in the apartment, which we appreciated.
Both beds have good reading lights, which was nice. We could have used a little more hanging space (there are hooks on the wall for hangers, but no closet). But for people who don't have many hanging clothes that wouldn't be an issue.
The neighborhood is lively and not touristy, with many cafes (we liked the one at the corner, Cafe des Anges). There's a grocery store right downstairs. The metro stop is a short walk away and one line goes along the right bank, to many of the main sights, such as the Louvre, etc., so it's easy to sightsee. But we also liked being away from the tourist areas and eating at places the locals go to. If you're around on market days, (Thursday and Sunday) don't miss it.