I stayed at the shared flat for one night, but the hosts didn't inform me that the doors couldn't be locked. This information was also not included in the iOS app. If I had known this beforehand, I would not have stayed there, as it posed a risk for leaving valuable items in the room. Ignorant of this, I closed the door to the room when I went out for dinner. Later that night, I had to contact the landlord in the early hours of the morning because I was locked out of my room. He was very annoyed and told me it was my responsibility to figure it out, despite being a foreigner who was only there for one night. In the end, he helped me contact a locksmith, but I had to pay for it myself because the landlord wasn't responsible. To make matters worse, there was no water in the residence when I arrived, and I couldn't wash up. I had to talk to the building's caretaker in the early morning before leaving to have the water turned on. It was the worst experience I have ever had abroad.