Simply here's what happened.
Before I arrived, there was a construction of the building has started and those people worked RIGHT in front of the window of my room. They worked from 8 to 16 every day except Sunday. While they were there, I had no privacy because there was only a very thin curtain for the windows and so loud noise was continuously going. What's more, one day the dirty water from the construction was coming into my room...
Apparently, the host knew the fact of construction before my arrival but she did not tell me any information regarding it. I ended up having to cancel and move to another place. Needless to say, this was the worst experience of Airbnb.