The apartment is very nice and clean with all expected facilities, private/personal furnishing and truly awesome vistas. Very minor shortcomings are the angled/lowish ceiling (watch your head, but you'll get used to that) and the bathtub which does not allow for standup showering. The apartment itself merits five stars due to the outstanding views and location.
Unfortunately, check-in and check-out were not as "flexible" as it said online (no further specifications). Therefore, we had to reschedule our arrival and stay in a hotel the first night because we could not guarantee a timely arrival in the evening (before 21.30) and were not provided access to the keys. There was further uncertainty and doubt regarding our departure, though in the end we could leave as planned at eight o'clock without meeting our landlord at all, who lives 200 Km away.
Verbal communication was very nice and friendly, however, messaging - which made up the bulk of our communication with regards to the apartment - was slightly brusque and kept us uncertain with regards to
arrival and departure until the last minute. This last circumstance cast a minor shadow over our stay resulting in our four-star rating.