We spent 2 nights at this home (3 adults). We didn't meet the host and self checked in and out. It went well, we enjoyed the courtyard and the cats (one belongs to the house and the others live next doors).
I will mention 2 things that are not the host's fault at all but which could help other guests. My mother felt uncomfortable with the 2 glass ceilings. Even after covering them with a blanket she could not walk on them so one of the bedroom was off limit for her as well as the office/ area. She had to take the kid's bed in the 2nd bedroom because the bigger bed was in a mezzanine which required to climb a few steps without railing. She was worried she would fall at night if she needed to use the bathroom.
The house doesn't have A/C which I'm sure is fine most of the year, and not the host's fault at all but we were unlucky that our 2 nights happened during a heat wave so it was impossible to stay inside or even go to sleep until very late at nigth. A few small fans were available but were only moving hot air. Again not the host's fault but for those who need A/C to sleep at night this is not the place for you.
Besides that, this appartment is a wonderful and exciting way to discover an artist/ bohemian style Parisian appartment, I'm glad I had a chance to see what tranquil and surprising homes hide behing those big wooden doors.