We had a wonderful stay at Camille's studio! We arrived in the late morning after an overnight flight and Camille was generous enough to let us check-in early and even let us wait on her own rooftop patio for 20 minutes while she finished cleaning the room.
The best part of this studio is the location. Just outside the door in either direction are tons of great bars and restaurants and it is an easy walk to major sites like the Louvre. It is also only a 5 min walk from the Châtelet–Les Halles station which is a major transit hub, including metro lines and the train to the airport.
The studio itself was very clean, cozy and quiet. It is small, but we didn't mind given that we spent most of our day out of the apartment and exploring the city. In the evenings, the window seat overlooking the courtyard and Paris rooftops was a great place to have a glass of wine and relax.
As other reviews mention, the apartment is on the fifth floor, which after the initial hike up with our luggage really wasn't a big issue for us. The one downside was that we happened to be in Paris during a heat wave (100+ degrees), so the top floor location and lack of a fan made sleeping difficult some nights. Despite that, we had a great stay and would definitely return to Camille's studio again!