Response from Joost:
I have send Antonio messages about bedsheets that were left to dry on the door. I apologised for that. He is in his right to complain about that. BUT:
The coordinator/cleaner of the house reassured me the apartment was left in the same state which was satisfactory for other guests. So I don 't get why he regarded it as extremely dirty. So apart from the hanging laundry (which was washed) it was not dirty or more untidy than usual.