We stayed at Heloise's apartment from September 9 - 13. It was very easy to reach from the airport and my boyfriend and I absolutely loved the location. It was nice and quiet, not many tourists, but extremely easy to reach the center of the city taking the metro.
Heloise's apartment was extremely clean and cozy. The photos of the view do not do it justice - you have to see it in person! It was great to have the small kitchen, as we used it for breakfast each morning and also prepared a dinner for our last night in Paris.
Communication with Heloise was great. We kept her updated on our arrival time and she greeted us promptly. Her husband helped us carry one of our suitcases up the narrow, winding staircase.
If you are looking for a nice restaurant nearby, I would recommend the Augustin (79 rue Daguerre - about a 15 minute walk from the apartment). We ate at much more expensive restaurants during our stay in Paris, but this meal was our favourite.