This is a reasonable apartment at a good location in Paris. That said, I think I felt a bit misinformed by the earlier reviews; I was expecting an apartment that was substantially nicer than a normal AirBNB apartment set up for full-time rental in Paris, but I think this apartment is pretty normal in terms of apartment quality and doesn't deserve a price premium over the other apartments near it.
The thing that the photos don't convey is that the apartment is quite dark. The windows on both sides face small courtyards whose opening to the sky is quite a few floors above, so there isn't much natural light in the apartment. Opening the windows also leaves you subject to a good bit of cigarette smoke (at least on a bunch of the days in the middle of our stay, likely from another rental apartment) from people in an apartment a few floors above that comes down through the small courtyards quite strongly.
Communication with Pierre was pretty good, although it would have been nicer if he'd asked some questions he needed answers to about check-in and check-out a little bit sooner (about check-in, because he sort of needed a response while I was asleep in California). He seems to rely on guests being responsive to SMS messages quite promptly (which I'm not when I'm asleep, or when I'm on vacation as I was in Paris).
It was also a little bit odd that I think Pierre entered the apartment when we weren't there to retrieve an item a previous guest left (a hairdryer) without mentioning this to us. We just noticed that the second hairdryer disappeared after the first day of our stay, which was a bit confusing.