Sophie's apartment was exceptionally clean, and located in a very nice neighborhood with good connections to public transportation. I really enjoyed staying as her guest, and would definitely book her apartment again. Sophie was very quick to answer any questions, and contacted me several times proactively. On the day of our departure there was a major disruption at the CDG airport, and a lot of flight were cancelled with a short notice. Sophie was super nice and understanding and helped us a big time when we had to extend our stay for one night while we waited for our flight carrier to figure out a new routing for our return trip.
My only concern about the apartment was the lack of air conditioning, but at the end that wasn't a problem at all. The temperatures in Paris were between 30–45 degrees Celcius (86–113 F) during our stay, but the apartment stayed relatively cool, as there is a good airflow through the house when windows are opened at each end. We kept the shades closed during the day when we were sightseeing to keep the heat out, and opened the windows after sunset when temperatures dropped. Because the apartment is in the 4th floor, there is enough wind to push fresh air in. This made sleeping surprisingly easy despite the scorching heat wave. Something I would have never believed is possible without an AC!