This apartment is incredible - it is like the Tardis. I expected it to be way smaller than it was and indeed on opening the door it is just one room (with a toilet off it) and a small spiral staircase. It opens up upstairs (within the limitations of the roof slope) and there are four decent-sized bedrooms - three kid's ones and a double.
This apartment is brilliant for feeling like you are really living in Paris, not just a tourist. It is a family home, rather than a faceless, empty, bland apartment. There is a Carre four supermarket almost opposite it and the area has several bars, cafes and restaurants.
As someone who travels a lot with kids it can be tricky to know what the place on the screen will be like in practical terms for families so these comments aren't meant to be negative but a heads up - things to consider if you have young children. The apartment is on the 4th floor with no lift so if you have a buggy be prepared to leave it on the ground floor. The spiral stairs from the living room/ kitchen to bedrooms does not have a stair gate. It is fine for confident walkers but I think I would be nervous if travelling with toddlers. That said there are plenty of toys for kids to play (carefully) with. As an attic apartment, it does get hot. There are mobile air conditioning units but be aware if you particularly suffer from the heat.