This apartment is very nice, clean, and in a central area of Paris - Le Marais. I was visiting during a heat wave and the downstairs stayed very cool, and the second floor was a bit warm but they provided fans and there were windows to open. Check in process was easy - someone met us at the apartment in person.
There is one small step to get into the courtyard for the building, and one small step to get into the apartment. We stayed with my grandfather so this was good - he stayed in the first floor bed/bath. The rest of us stayed in the 3 upstairs bedrooms.
The only challenge with this place is that there is no soap, garbage bags, much extra toilet paper, shampoo, sponges for dishes, dishwashing detergent, washing machine detergent and the like etc, unless you either bring your own or pay a fee for a small kit. In the US these things are always included so that was frustrating, but maybe that is the norm for Paris airbnbs.