Hervé's apartment is the perfect place to stay in Paris. The location is central to many great tourist attractions, and is also easy to get to from both CDG and ORY airports. Correspondence with Hervé was always quick and easy, and the instructions for checking in were crystal clear.
The apartment itself has everything you need, from cooking utensils, towels, a washing machine, and a comfortable bed. It was the perfect home base for a week exploring Paris, and the nicest Airbnb I've ever stayed in. There's a Starbucks and Monoprix (grocery store) downstairs if you need anything, and subway lines directly across the street.
As others have mentioned, if you're concerned about stairs, you may have some trouble because the apartment is on the top floor. But the climb is worth it, and you'll also work off some of the baguettes you eat while out exploring each day.
I will absolutely stay here again the next time I find myself in Paris!