This apartment is just okay. The location is very central in Paris, but, in a busier/noisier area closer to Hotel de Ville than truly in the "heart of the Marais" (which is where I thought we would be, based on the description and approximate location on the map).
Pros: It is right next to the Centre Pompidou which is a wonderful museum if you are into modern art (the building itself it a piece of modern art!). There is a grocery store (Franprix) very close, and a couple a cute cafes and bakeries. The furniture in the apartment is pretty cute and stylish (though it is rather spare). Communication and check in were excellent, both with Paul and his property manager person Neils. We used Whats App and the Airbnb app to communicate and both were easy and prompt. Neils could not meet us for check in, but gave us the codes to enter (which was fine for us).
Cons: For total transparency, we booked the apartment for a week, but only ended up staying there 3 days before we moved to a hotel (and had to eat the full cost of the unused nights). For credibility's sake- I have been using Airbnb since the very beginning (I was a host for many years, and use it when I travel to Paris annually), and this is the first time I have left an Airbnb early. Maybe I am just getting more high maintenance in my 30s, or maybe I just have decently high standards. Both are likely true. It's not that this was a terrible place at all, it just wasn't great. Eventually it started to feel like we were camping. The bed in the bedroom is a futon, and really not comfortable enough for more than a night or two (especially when you already have jet lag and just want some good sleep!). There was no toilet paper upon arrival, so we had to go out and get our own. The shower has limited hot water (both of us couldn't shower the same day), and there is no wall hook for the shower head (which, I know, is pretty typical for France but no less disappointing for a person who really likes a good shower). The towels + sheets seem quite used and low quality. There is no place to hang clothes or put anything away. The size of the apartment wasn't an issue (it is small, but perfectly adequate for 2 people), it just wasn't very well-equipped for travelers.
In summary, it is 3 stars for me. If you are just looking for a decent place to crash while you explore Paris for the first time, it's probably a good choice. If you want to really enjoy and luxuriate in your time in Paris, as we did, you might consider a different property.