I really enjoyed staying at Jean-Marc's studio. It was a good size, perfect for one or two people. I had no problems getting in touch with the host and received a warm welcome. The building is very secure, right next to the station. It does get rather busy at night, but you can't hear any noise coming from the street if you keep windows closed. I would definitely recommend staying there to anyone who enjoys Montmartre area and doesn't mind it's character.