Olivier's place is well situated in the 9th arrondissement, close to many good restaurants, including some of the best vegan places in Paris.
The apartment was clean and quiet, with a good shower. Paris was very warm when I was there but there was a good breeze flowing in when the window was open.
If you're tall, be aware that there is a slanted supporting beam bisecting the living room, and some slanted ceilings to watch out for. I'm 6'4 and had to be careful.