In short. Great place, great apartment, great location and great communication.
The apartment is professionally prepared for Airbnb guests with everything (and more) you need. Among the many nice touches was the filtered water stored in the fridge with a separate filter system to make your own clean water. When you are new in a city you never know if the tap water is OK. Frédéric took care of this problem.
Things are clearly labeled around the home.
We especially loved the 4 windows to the courtyard which we could leave open during the hot summer days at night, and yet had absolutely no noice. The bed is comfy, the bath is spacious with a separate toilet and the kitchen is fully equipped.
We also felt safe since you need a code to get into the courtyard, then another one to get into the building inside the courtyard, and finally the apartment door which is rather solid.
Note: There are two flights of stairs if have some luggage.
(Well, even you have no luggage it’s still two flights:) No elevator (which is common in old Parisian apartments).
All in all a precious place fit for a long term stay. Definitely recommend it.