Willy responded very quickly to our messages; he answered all our questions, gave us directions from the airport to his home, and explained everything we needed to know about the apartment. He wasn't in France during our stay, but we kept in touch with WhatsApp.
We stayed with three (3) ladies and one of us slept on the couch which had enough space. He had enough bath towels, pillows and blankets for all three of us. We brought our own toiletries and bought our own bread, cheese, and booze from the supermarket (downtown).
The apartment is very small, but has all the basic necessities and was big enough for all of us. Very secured door, so that made us feel safe. It rained every day during our stay; the "in-between" entrance gets very slippery and there's not a lot of light, so be extra careful at night. Also, the stairs: soooo maaanyyyy! But we only used them twice a day, so we survived.
We're used to traveling with public transport, so we weren't bothered by the long traveling to the city center. Also, public transport in Paris is very cheap, so we chose to be farther away from the center (cheaper Airbnb) rather than closer (more expensive Airbnb). Conclusion: we enjoyed our stay and definitely recommend Willy's apartment IF you don't mind being 30 min. away from the center by metro/subway.