It was on the morning that we would leave, there was a stranger opening the door without knocking on it. He was a bit drunk and seems had a hangover. We were a bit frightened and checked the door of the apartment and found it could actually be entered without the code. Then we also checked the front door of the building, it was also not locked at all. You don’t have to type in any code to be able to open the door. We didn’t know this until we checked it the morning we left. This was kind of severe, but luckily we were safe and the intruder didn’t cause any more troubles. This was a really bad experience.