The Alexandre's apartment is perfectly located - between two metro station of the different lines (about 3 min walk) and near two railway stations - north and east. It's cozy and very atmospheric. Here you can feel the Paris as it is with the view on it's roofs. You can reach all centrally located places by walking. There are two supermarkets close to the house and diversity of cafe and restaurants.
Keep in mind the absence of elevator. But climbing up stairs you have a good training after french croissants)))
Alexandre is a nice host, who will provide you a lot of useful information.