I stayed in Louis' lovely apartment for two weeks, and I found it to be exactly as he described. It's on a quiet street, yet there are major museums, restaurants, metro/RER stations, grocery stores, etc. within easy walking distance. It's in a very safe part of town, and I never had any concerns arriving back late at night.
The check-in process was very easy. My original flight to Paris got cancelled at the last minute, and Louis was able to able to meet me several hours later than expected.
Louis was very communicative and responsive to all my questions. He offered lots of suggestions for things to do, restaurants to go to, day trips outside the city, etc.
All in all, I wouldn't hesitate to recommend the apartment or Louis as a great host!