We were travelling with two teenage girls and everyone was very happy with everything! We liked the bohemian style of the apartment, the view (!!!!) and the terrace. It was very clean and as the owners normally live there you have everything you need. One girl was sleeping on an air bed as the forth bed is a baby bed, as described. We were very happy that it was possible to stay with four "adults" thanks to this as the view is unbeatable. Washing up while watching the Eiffel-Tower and seeing it lying in bed or from the balcony, this is just great!!!
Communication was also perfect so we would love to come back!
A tip for people travelling by car: parking on the street is very expensive and it is really difficult to find a public parking where you can leave your car for some days. The Novotel is pretty close to the apartment and has got a parking at a reasonable price (considering it being in Paris), it is open for everyone.