I spent ten day's in Auriane's flat and it was excellent. The building is very secure and requires two codes to enter. The flat is very spacious and there is a lot of natural light (and there are shutters if you want to block the late day sun). The kitchen is well-appointed, the bathroom is modern, and the bed is very comfortable. It is on the 6th French floor/7th American floor, so bear that in mind if you have a lot of luggage. But the climb is completely worth it for the pretty view and the quiet. You can even see the very top of the Eiffel Tower from the little terrasse. The street is calm and residential but there are nice bistrots and an excellent grocery store just down the road (Carrefour City has everything you could possibly need). There is also a Metro shop a very short walk away (Pyrénées), which will take you to Le Marais in just a few stops. I loved my time in Belleville and would definitely stay at Auriane's place again.