We had a lovely stay in Etienne's apartment!
The location is fantastic and in a very trendy area with many exciting restaurants and shops.
The apartment is conveniently next to a metro and very easy to get to. We spent most of our time walking and would trek to Montmartre and Sacré Cœur one day, and to the Louvre the next.
Be forewarned the apartment is on the 5th floor. It wasn't an issue for us, but if you have mobility issues, it is something to consider.
We would love to stay again on our next visit!