The apartment is exactly as advertised.
Pros: Good location: Not an area with touristic attractions or the nicest shops but within walking distance to the Les Halles area and well connected by public transportation. 2 subway stations very close by. Also the area is nice to go out at night to have a drink. Clean and well equipped apartment. Very nice and quite big living room with lots of light. Wifi works very well. When we stayed the hosts weren't around but they had some people take care of cleaning, keys, etc... and also had a very nice arrangement to leave luggage nearby before check-in and after check-out (with some limitations: not on Sundays, need to pick up luggage before 5:00pm...). The typical "welcome instructions and tips" folder left by hosts for guests very complete and accurate. Hosts very quick to respond by AirBnB messaging even when not in town.
Cons: It's a 3rd floor with no elevator. Can get noisy because of a bar downstairs. No AC. The room with the double bed is not very comfortable. It's tiny, you need to duck to walk and climb a ladder to get to the bed. Down the street there's sort of a meeting place for homeless people where smell is quite bad (can be avoided going a different, slightly longer route to one of the close-by Metro stations. Communication in English with the hosts was perfect but not so much with the people they leave in charge of keys, etc...
Overall very recommended.