There is lots to love about Frenck's place: The location is stellar. We were so close to the Metro Station (Hotel de Ville) which helped connect us to everywhere we wanted to go. We were within walking distance to great shopping and eating.
Franck's place is accessible through an internal courtyard. The best part of this is that the place was very quiet! We were on the third floor, but I never heard a peep at night, even on an (outside) loud Saturday on the street.
The bed was great. My wife and I often complain about too-soft beds that have us sink in the middle; this was soft and firm. Very good.
We did not spend a ton of time in the apartment during our stay, but found it quite comfortable (and appreciated the washing machine in after a week in another country).
The only think to warn people is that the stairs to the third floor are steep. If people are elderly or have trouble with stairs, they should be wary.
The oven did not work, which we did not know until we bought a frozen pizza, but Franck did not tell us until we communicated with him later. To be fair, he did offer to replace that during our stay if he could do that, but it was not that big of a deal. Otherwise, his communication was great. he was a quick responder.