We had a great stay and the communication was wonderful - both leading up to and during our time in Paris.
The apartment is extremely clean, very quiet, and in about as ideal of a part of the city as one can ask for. We quickly and easily could walk or GM catch the metro to anywhere across Paris. And if you just need a quick coffee, bite to eat or groceries, there are spots for all of these within a couple of blocks (coffee and food is merely steps away).
The only challenge of this apartment, as others have mentioned, truly is its size. It is very small, especially the bathroom/shower. But this is properly shown in the listing is not something they are trying to hide - I viewed it as a trade off for an amazing location at a reasonable price as well as an awesome host who is readily available and willing to help out with suggestions whenever needed. So as long as space is not a concern for you, you’ll be extremely happy with this apartment!