Daniela is very sweet and super fast to respond. The apartment is really cute and a unique way to stay in Paris - among the rooftops is not a joke! Limited extra amenities you may find elsewhere...but you won't be spending much time in this place if you're visiting Paris anyway. Probably only suitable for 1 or 2 travelers. I wouldn't try and put more in this studio, especially if you have luggage. Not a ton of space for much more than morning tea/coffee and sleeping...but that's all you should need :-).
If stairs aren't your thing, this isn't your place. You've got quite a ways to climb to get to the studio and a ladder to climb to get to the lofted bed too! But you can't beat this location and the atmosphere of the surrounding area. It will be a little loud at night from the street noise especially if you've got the windows opened to the Parisian air (which I would recommend). Would return to this location on a future visit. Great value, great location and great host!