The biggest problem: we booked this apartment for 2 days, but the keys were not dropped off where they were supposed to be the first day, so we simply couldn't get into the apartment. This on its own, I don't think justifies the 1 star rating, since it seems like it was an honest mistake in communication between the host and the cleaner, what made this a 1 star for me was how the host handled it. When I initially messaged for support, she was insistent we were at the wrong location, or checked in too late. After we convinced her we checked the right location, she finally made the call to her cleaner to get us the keys. The worst part is that she promised a refund for the first day over the phone, but has not followed up, paid, or responded to anything I sent afterwards (it has been over a week).
One of my friends also got hives from some of the sheets, and we found the carbon monoxide detector unplugged in a closet.