Jonathan's apartment was a really comfortable place to stay for 6 nights in Paris. He was a great host who remained in contact throughout my stay, and even welcomed me with a bottle of wine. As others have commented, the bed was incredible. The shower was a good size for an average sized woman, but could be small for bigger people (as a heads up). The kitchen is well equipped if you are looking to make meals or prepare snacks for the day. There are shops close by to get a few groceries, and nice restaurants, bars and a larger grocery store just a short walk away. The metro is close by and it's just a short trip (30 minutes door to site) to most tourist sites. It is on the third floor with no elevator.
The only negative that I can say is that sound travels from the street into the apartment. I live in a major city with lots of sounds and I found this disruptive both late at night and early in the morning. The other neighbours I met in the building and on the streets were very friendly.