The apartment is very central with easy access to public transport (there are 3 metro stations all within 5mins walking distance). It is in a nice neighborhood, not too touristy, and has a great selection of cafes, restaurants, fruit&vege market, butchery and a supermarket. Guillaume and Penelope were very helpful and always responded to our queries right away. They also gave us a list of fantastic restaurants (some of the best ones we have had) all within easy walking distance (2 block radius).
We really enjoyed our stay, it's an excellent location to get around, we were able to get to lots of major sites, while sneaking in a few afternoon naps in between :)