We stayed at Jean-Marc's apartment in Sept. 2019. The apartment was extremely clean and cozy. The place had recently been painted and new updates in the bath/shower room were nice. Kitchen was adequate with the basic accommodations. This is a typical Parisian apartment that we very much enjoyed staying at. We would consider staying here again if we returned and wanted to explore the Montmartre area of Paris. Very convenient to metro lines and RER train lines. When we left Paris we took the metro and RER to the airport which was actually very easy and much cheaper($2-3 per person) than a ($50) taxi service.
The apartment is literally a 2-3 minute walk to the Moulin Rouge. If you are not familiar with the area I would say much of the main strip (Rue de Clichy) is not exactly kid-friendly storefronts. However, once off Rue de Clichy we were in very typical Parisian roads, storefronts, and cafe fashion. The apartment is a secure location with access key required and very quiet and calm in the courtyards. Very nice neighborhood and approximately a 10 minute walk to beautiful Sacre-Coeur. I would recommend staying with Jean-Marc and his apartment for a few days or a week at a time.