The apartment is a good size, sleeping 6 in 5 bedrooms easily. The only problem for us was getting to the 4 single rooms required my 74 year old mother going down some narrow spiral stairs. Also there was no kettle in the kitchen, and for us, not enough saucepans and cooking utensils.
That said, it was very clean with plenty of space and storage space, in a quiet block. Only 5 mins walk from the nearest metro that took you into the centre of Paris in less than 10 mins.
I would stay here again, and recommend to family or a group of friends.