I very much enjoyed my stay at Nathalie's place.
The room itself was spacious and well decorated, and the rest of the apartment clean and bright. We shared it with two others -- Nathalie's roommates -- but It never felt cramped.
Having lived elsewhere in Paris, I also appreciated the neighborhood; the area isn't at all touristy, and instead feels quite authentic. There are several cafes and pastry shops nearby where staff were all very friendly, as well as Pere LaChaise, Paris's largest cemetery and a good place to explore. It's also easy to get to the tourist attractions you might expect to visit.
Ultimately, I would definitely stay here again.