Montmartre is a vibrant neighborhood, and Yassine's apartment is perfectly located in it--just minutes away from several Metro stops (Anvers, Abbesses, Cadet...) and many excellent bakeries and restaurants; the bakery up the street on the opposite corner (Mamiche) was amazing, and we also loved the Thai restaurant (Thaï House) just a few feet away from door to the building. For the most part, we were comfortable in the apartment and appreciated being able to use the kitchen and the washing machine. Overall, Yassine's flat is a great value, especially because it is so well situated in the neighborhood and has pretty much anything you might need (e.g., umbrella, cooking supplies, etc.). Yassine is also a great host, who checked in via AirBnB message periodically to see if we needed anything and was very flexible with check-in when our flight was delayed getting into CDG.
A couple of notes: 1) The back bedroom, which has a window facing the courtyard, is quiet; however, the larger, front bedroom, which faces the street, can get quite loud at night and early morning, even with the window closed. This can make it challenging to run the air conditioning unit in the room, which needs to be vented out the window. 2) This apartment is truly for those who do not have any mobility issues; not only is the flat on the 3rd floor with a winding, narrow staircase, but the tub/shower requires a high step for entry/exit (the bathroom has been partially renovated since the photos on the AirBnB website).