The flat is located right across Jules Joffrin. Montmartre and Flea Market of Saint-Ouen are a 15 minutes walk away. It is also close to many metro lines that will bring you everywhere! You will love the location. It is very typical Parisian neighborhood. Rue du Poteau is two blocks away and you will find restaurants, bars and all the stores you need. The restaurant El Tast and the bar la Recyclérie are around too.
Public transportation is a bit of a maze in Paris. I recommend you to book a transfer on the app Bonjour Paris (G00gle or Apple store).