Stop your searching now.
Sandrine's place is huge, very tastefully decorated, and a very enjoyable space to be in. The staircase is a bit trying with large suitcases, but as you only need to bring these up once it is worth it at the end, and in any case it is not especially common to find parisian apartments with elevators. The apartment is effectively the whole top floor of a nice mansard-rooved building, so there is lots of natural light from the many windows.