We just returned from Paris, and stayed twice at the Hotel des Grandes Ecoles. (before and after the RS Loire Valley and the South of France tour).
https://www.hotel-grandes-ecoles.com/index-en.html
The setting was beautiful - quiet yet convenient to everything. For dinner, we would often buy takeaway food and a bottle of wine and eat in the garden.
On our first morning, we met a woman who stays at this hotel twice a year, and has been doing so for the past seven years. A couple of days later, we talked to another couple who had been coming to the Hotel des Grandes Ecoles for 20 years. Toward the end of our stay, we met a woman from Canada who had been coming to the hotel every year for the past 40! She said: I have travelled all over the world, and this hotel is my favorite spot.