In principle, check-in was only possible after 15:00, in our case only at 16:45 due to misunderstandings. Check-out, however, had to take place at 11:00 am. Communication was rather complicated. I didn't get a phone number where I could have easily clarified things until shortly before arrival.
The neighbours above the flat were particularly annoying, walking around in their rooms until three or four in the morning. Otherwise a very nice flat with a great view.