This is going to sound weird and I can guess the answer but there's no harm in asking as there may be some good advice out there.
I rent a room in Sisli with no contract i.e. there's nothing formal in place.
This morning I caught one of the landlord's Turkish assistants leaving our home with a girl and we discovered that he had spent the night here in one of the rooms! He must have arrived around 1am or later. We wouldn't have noticed except that I got up very early this morning.