Every piece of furniture had stains. There were marks and stains on every wall, included the leftover parts of a large insect that had been smashed with a shoe against the wall by the desk. The bathroom had the constant scent of cigarettes, which I tried my best to cover with candles and incense.
A random person knocked on the door unannounced the second day of my stay, claiming to be with the cleaning crew and requesting access to the apartment to "drop something off". There was no message from the host informing me of this or asking permission to send someone over, and he interrupted a conference call I was on for work. I refused him access and returned to work, but this interruption was unacceptable.