I didn't meet Zeki; I just got the key from his neighbors. They were friendly people who had just spoken in Turkish.
Some neighbors seem unhappy with Airbnb and accommodating strangers in their building.
There is a code to open the door. If your phone has no battery and you can't check the code on your phone, there is no chance to enter the building. If you knock on the door, people complain and speak badly with you.