Our stay at Thomas' apartment was good overall... there were pro's and cons but great for the most part.
The only problems we had involved finding hairs on the bathroom floor and in the shower. We were also warned about the neighbourhood by our taxi driver as we were dropped off, it seemed a little bit sketchy but once we were in and the morning came, it was fine.
Everything else was lovely - very comfortable bed, great powerful shower, quirky decorations and a lovely french feel. The location was great - it was 1 minute away from the metro, really close to supermarkets and a 10 minute walk to Monmatre/Sacre Coeur.
Thomas' place had a lot of character and you'll certainly feel like a local - I would recommend it as a place to stay.