Julien is very responsive and, for those this is relevant to, possesses excellent English. Check in was really easy. The place had most of what we needed.
The apartment is literally right next to the Sacre Couer, so there are lots of tourists nearby regularly. Montmartre is kinda funky and not that close to the center (about an hour’s walk to the Seine) but there are 3 trains nearby.
This has nothing to do with Julien or his apartment but just wanna warn visitors to Paris: I had my pocket picked on the train, and I’m no travel neophyte. Be very alert and don’t allow anyone to engage you randomly. If you take the subway stay away from the doors and keep your hands on your valuables!