Poor communication with the host. During our stay there had been a party which the host didn't "know" off until the very last moment. I was trying to reach out to the host and the person in charge of the apartment. Neither one of them responded to my messages nor my calls.
So be aware if sth occurs. You won't get help nor will the host come up with a solution!
Another thing to know; there is no cold air coming out of the airco's in the apartment!