I stayed in the apartment for a bit over two months. It is very cute and clean and in a very nice area of Paris, not too far from the Seine and the Eiffel tower is in walking distance. For a short vacation of up to a week it probably is the perfect fit. When you stay longer and have laundry to wash you will notice that the apartment is in a laundromat-free zone and that the next one is about 15 minutes walking distance away. It is doable, but it is a bit of a hassle.
In terms of accessibility it should be noticed that you need to hands to open the front door and lots of will and energy to walk to the sixth floor. But once you are up there you have a nice view over picturesque rooftops and chimneys.