Charles was very nice when he welcomed me. The private room is large with a nice terrace and is reasonably clean.
I just did not enjoy the location. It's reasonably far from the city center (48 min to Eiffel Tower and 30 minutes to Louvre) and felt quite unsafe at night (near Gare Du Nord, which is not a safe area). I started taking ubers to the place from the city because I didn't want to walk back. Would have been wiser to just have spent a little extra on a place closer to the city.
Also, there was no lock on the door to the rest of the apartment. This made me really uncomfortable at first, but Charles (and I think his girlfriend or wife?) were perfectly safe.
Charles was very nice too. He offered me some fresh strawberries one night, which was very considerate. However, he was not very quick on responding to requests. When I needed an umbrella, he did not respond until two days later when I already was drenched by a Paris downpour.