We were a family of 4 people at Elsa' s apartment, and our stay there was great. The flat is very spacious and cozy at the same time. The location is good, and the street is quiet (which often not the case in central Paris).
Most important, the flat has its own welcoming spirit which makes your stay there very comfortable. The time that our family spent in Paris gave us good and warm memories not only about the city, but also about this flat. Definitely recommended.