It was nice to stay at the appartment of Stéphane, it is nice, well-equipped and located in the center of Paris, right near the metro station. The area is plenty of shops and restaurants, you can find there everything you need. There is no elevator in the building but I enjoyed the challenge of climbing up the 5th floor everyday (sometimes twice a day haha).
Though we didn't see each other, Stéphane was easy to communicate with and very precised, so I easily found the appartment and didn't have any problems.
Thank you Stéphane!