Finally the building door opened to an open door flat in total silence.
All the doors I tried first (room as per instructions was the first on the left) - in the corridor were closed.
Walked passed a messy kitchen and bathroom, both with laundry/towels on the floor.
Finally, 2 rooms left at the end of the corridor. The one on the right was half open, and I could see that it was occupied by a leg. On the left, the last door of this flat, maybe the one the host prepared for me? as all the other ones were shut or occupied.
Behind a knock, to my surprise, I found a man, standing half naked in a black garter staring at me as mortified as I was staring back at him in horror and fearing for my safety and life.
The first instinct that saved my life, was to run as fast as possible without looking back and getting myself to a busy street to safety, call my friend to get me an uber in a total panic, book a hotel and get myself out of this hell hole horror.