This is a solid option if you want an affordable place to stay in central Paris. It is small - just the bedroom, but if you plan on not spending much time in the room and being out and about a lot, then it's good for that.
It is very close walking distance to the Tuileries and museums like the Louvre and the Bourse de Commerce. Also not too far a walk from the Marais and Saint-Germain. The immediate area surrounding the street where the flat is is rather busy/touristy/not the nicest so it's not a quaint cute little street but you are close to the good neighborhoods.
My main two grievances were that our one window would not open so there was not great air circulation in the room, and the bathroom sink would not drain properly. Other than that, our stay was perfectly fine!