Nico is aware about the moisture in his place, my mistake was that i checked the place is 5 stars but in comments people are worried about the moisture as well. He tried to remove the problem as he turned on the AC, but it didnt help.
I notified Nico that this place was not healthy for us and he just said "good luck" (he is living just upstairs). he dont want to reimburse me(about 55 euros) because we left one light bulb on and the AC + I ate one croissant(from the included breakfast) and cleaning fee?! cleaning was maybe done by someone who loves spiders - the spider nets were in almost each corner. i really dont want to ruin your airbnb business, everything else in the house seamed really good ,but this problem is huge and not healthy for sure. start the renovation of the house, then make money from it.