The location of the apartment is excellent just 2 min walking distance from the metro station "Jaurès"...very central and safe neighbourhood. We walked back a few days at 12.30 am with no issues.
There is a very beautiful garden near the apartment "Parc des Buttes-Chaumont" a must visit and was the highlight of our trip. There is also a small flea market on Sunday which you can enjoy.
The apartment is on the 3rd floor so if you have lots of big bags like us you will have a hard time carrying them up and also the house has a vintage feel.