This flat is what it looks like in the photos. The view of Notre Dame is fabulous--you can see the towers as you fall asleep at night. The space is clean and uncluttered, with enough room for you to unpack. The kitchen has the basic necessities, and there's a small desk, a sitting area, and a dining table for 4. The beds are comfortable. The hosts are responsive and kind. My flight arrived in the morning and they let me check in early.
The building does sit on a very busy corner so even with the soundproof windows, there can be some noise from the streets and restaurants at night (I don't think it's enough to deter you from renting this place--the feeling of openness and the view more than compensate). I stayed for a month and brought a travel-size white noise machine with me, which took care of it. I would definitely stay here again.