Changed our apartment twice within 12 hours before we were supposed to check-in. Announced via text late the night before that we would get a new apartment due to changed conditions at the facility, where the new apartment had room for 5 people, while we had booked a stay for 8 people. Refused to give us a fair price reduction (four of us had to check-in to a hotel due to the limited number of beds in the new apartment and we would expect fair compensation). Checkin was impossible as the code to the door did not show up in the application as supposed to, when we eventually got the code there was no information as on how to enter the gate - a kind neighbour eventually helped us.
They were friendly in communication and tried to compensate for mistakes by sending breakfast over, but did not manage to help us where it matters - fair compensation and an apartment sized for the number of people who were visiting..