We had a lovely welcome from Jean Leon (who spoke perfect English, luckily for us!) and communication throughout was excellent. The apartment is lovely, with some kitchen bits neatly tucked away, comfy bed, and really nice big bath - perfect after a long day seeing the sight of Paris!
Only slight negative was noisy neighbours - we stayed on a Friday and Saturday night and heard loud music and voices from another apartment in the courtyard. Not Jean Leon's fault of course, but something to be aware of!
The rest of the time the apartment is really quiet and secluded, and off the street. The nearby area has lots of lovely shops, restaurants and character, and is well services for Metro stops to get into the city centre.