Pros:
The location is incredible, live like a real Parisian for however long your stay is. Close to MANY restaurants, cafes, boulangeries, etc, everything you could possibly want
its also a 2 min walk to one metro station, and 10 minutes to les halles which has a lot of lines/connections which makes getting around easy
the upstairs area is very nice and lovely, building is safe and secure if youre worried about that, no issues at all with anything like that
Cons:
It's a real apartment of course, so some of the door handled and railings are borderline falling off/apart, so dont expect a hotel
the place is actually serviced by a local company (this is mentioned in the ad just elaborating), so if you need something it can be a bit of a hassle to contact the host who has to contact the company or you contact the company but then they only work 10-6, for instance we asked for 2 more towels at the very beginning of the stay and never received, so once again not a hotel which is totally understandable but can be frustrating
also if you stay during a heatwave/hot summer months there is no fans and the upstairs does get hot, but that was mostly us getting unlucky with 38 degree weather one day!
Overall:
An absolutely stunning real Parisian apartment in an amazing location, as long as you know what to expect its a great stay, would stay again!