There were 14 degrees of Celsius in the apartment, despite the fact that AC was turned on and set to the highest value for more than 5 hours. The owner has offered additional blankets in the closet, and that someone can look at the AC the next day. It was unacceptable, and luckily Airbnb agreed as we got a full refund after we left the apartment to find a hotel.
The rest was ok. The apartment was clean and equipped with everything that was mentioned in the offer. The apartment owner responded very quickly to our messages.