Bugs in the bathroom.
The balcony door was broken and wouldn't close
The light bulb in the living room wasn't working.
The excuses of the owner were ridiculous. He wouldn't believe there were bugs in the bathroom. He initially said that the balcony door is fine and ultimately admitted that it's broken for ages. For the light bulb he said that the previous guests had broken it but didn't have the chance to get another one.
We had to cancel the reservation during our stay because of the government's lockdown measures. The owner denied to refund any money at all for that being not sensible at all.