You should note this is a very tiny apartment. They are very clear about it.
However, we loved that because it allowed us to have access to an amazing location in the heart of Paris for a very reasonable price.
If you get well organized with space, it is a very nice nest for one or two people for a few days.
They provide very good information, both for the check-in and in the apartment.
The location was terrific, so centric, close to restaurants, bars, attractions, the big and important metro station connecting to very important metro lines and directly to both airports (Orly and CDG).
It is at 15 minutes walking to Notre Dame or Louvre Museum. Or a 5 minute walk to a very important metro station.
Things that might not be nice for some people: being so close to bars and restaurants, it can get a little bit noisy late during the weekends. Since it is really tiny, you need to be well organized with space.