Veronique and Michael's apartment is fantastic. The view is all you could ask for from Paris, the accommodation, furnishings and cleanliness 5-star.
We visited as a family with a 10, 9 and 6 year old. There was plenty of room and allowed for family dinners overlooking the city and river.
Veronique and Michael are excellent hosts with clear communication from the beginning.
The kitchen is well equipped with all you could need, and the wifi is fast.
The stairs were fine for us, but if you were less stable on your feet it might be tricky - it is the 4th and 5th floor of a 16 century building after all!
I could not recommend highly enough.