Broken air conditioning. It was extremally hot in the apartment.
And very dirty.
Someone's black hair was all over the floor. I've asked to use the vacuum cleaner when they came to fix air conditioning, but they didn't. And Mold... God, it was everywhere in the shower! The corners on the walls were completely black because of it!
Hosts were very friendly but it doesn't help when apartment so dirty, especially considering COVID-19 situation in the world. Cleanness became an even more important thing then it was before!