We had a very good stay at Olivier's apartment. Check-in time was flexible and our communication with Olivier was easy and great. The apartment was very clean and exactly as described.
We weren't sure from the pictures whether the two bedrooms are separated, but in fact they are! The stairs go into the room with the two small beds, and there's a door from that room into the room with the larger bed.
We were in Paris in the beginning of July, and it was very very hot. The apartment doesn't have air conditioning, but with the bedrooms being under the main floor, they were significantly cooler than the upstairs area. We found that it was actually better not to use the small window/vent openings downstairs as they let the cool air out and the hot air in! There aren't any fans for circulation, so just keep that in mind if you're staying in the summer! Again, this isn't a complaint about the apartment, just something to keep in mind for those that want to stay in the heat!
The location was very nice, convenient to walking to nice shops and restaurants, and close to a Metro stop. We had no trouble navigating the neighborhood.
Overall our stay was great and we really appreciate Olivier's hospitality. We would definitely consider staying here again in the future!