This is a great, lived in apartment in a lively neighbourhood - an excellent base to explore Paris and also the vibrant neighbourhood. Nathalie was a wonderful host with excellent communication, support and an easy check-in.
The apartment is central to everything. We loved the restaurant "Jones" and "A La Renaissance" - both close to the apartment with great food, ambience and friendly staff. We also discovered some great boutiques in the side streets and bigger stores (Gap etc) on Boulevard Voltaire. For those who like walking - central Paris is accessible by foot - or a cheap cab fare to anywhere if you're travelling with tired kids! (Highly recommend the Luxembourg Gardens!)
I think this apartment would best suit people who plan to be out and about a lot - and are fit enough to manage the many stairs - my mother struggled a bit. We also happened to stay during very hot weather which meant the two upstairs rooms were very warm. Although it was a bit noisy with the nightlife this didn't bother us too much at all.

Overall, as an extended family of 6 we enjoyed our stay!