I really enjoyed my stay in Jocelyn's one bedroom flat. The location in Belleville has a great charm and it is pretty well connected with the Metro stop nearby. Jocelyn welcomed me when I arrived and was very responsive to messages.
The flat itself was comfortable and there's some seating in the courtyard. One of the hobs was broken when I was there and there was no Wifi, but this wasn't really an issue for me as I was out and about all the time. I would also say, if you are looking for somewhere polished this might not be the place for you. But as a comfortable place to base yourself for a stay in Paris it does the trick.