Even though they state in the description the apartment is 35m² (and I admit we overlooked it) the pictures did make it seem a lot bigger than it really is. We paid almost half of that for double the room in the same region. Calling it a penthouse is going by the specific definition of the word.
I do have to say that the hosts were VERY nice and solicitous whenever we needed anything. The apartment also did have an amazing view if that's what you are looking for.