I stayed in this place with my sister for 3 nights. We have chosen this flat because of the positive reviews on how welcoming was Karim as a host, but we never got to see him and we actually learned he does not even live in Paris. He was not prompt to answer how we would get the keys for he flat which was unsettling, only a couple of hours before arrival we received an answer on it and at the end it was a different person who turned up. Equally we had to pull the answers on arrival as well as on leaving the place. If you lack a bit of French, it may be frustrating.
The flat was exactly what described in the site and the area was what expected according to Karim's description. You have the basic essentials in the flat including a filter coffee machine with coffee, all just as described, and although the bed is a sofa bed, it was really sturdy and comfortable (duvet and pillows with covers provided but no mattress bed sheet). The flat is warm and quiet. The area is a very lovely and a safe part of the city with all the shops and amenities one needs to taste Paris, and Karim leaves a guide to the shops around.
Close by there are two stations from the same line, and a main train station to leave your baggage if necessary.
I would recommend it, but hold your expectations on the hosting, although once installed, we needed no additional assistance.