First of all: The location is AWESOME! The view is breathtaking and that couldnt be better.
The apartment itself is a good standard and I guess a bit renovating/investing might help here and there. You feel nevertheless comfortable. I would rather recommend the apartment for 2 instead of 4 persons at all (due to the second sleeping room, which other comments already decribed).
The stairs towards the apartment didnt bother us - that’s doable and simply a bit workout.