Me, my husband and 11 year old son stayed at Jean-François place for our family vacation in Paris in July 2018. We had an amazing time in Paris, and part of that was because this place is fantastic.
Jean-Fançois was great communicating before and during our stay. He was there at check in to give us the keys and explain everything. The place has an amazing view. During our stay, they were repairing the exterior of the building, so it was covered with a net, but it didn't affect our views of Notre-Dame.
It is on the fourth floor, and we did have luggage, but seriously do not pass this place up for fear of climbing stairs with luggage, you only have to do it one time and it is worth it.
The beds were really comfortable. My son loved the motorized bed in the living room. He thought he was the coolest kid ever sleeping on it.
There are bars downstairs, but as long as you close the windows, and turn on the fans, there is no noise at all. Jean-François, told us he was in the process of installing and AC system, so it should be even better soon. We got 90 F temperatures during our stay, and it was cool enough to sleep perfectly.
The bathrooms were spacious enough for Europe and were really clean.
I would definitely recommend this place for anyone visiting Paris!