Yeap. Dealt with Airbnb mishandling my issue over a one night $50 stay.
Owner of room apparently leaves the door key in a mailbox. Previous renter apparently took it with him when he left leaving no way of getting in. Owner obviously did not live nearby. I eventually waited for someone to exit the complex so I could get in. The door to the apartment had a computerized lock but that basically meant I could not leave the room at all. Room of course was also not cleaned from the previous customer since all the towels didn't appear to be thoroughly washed if at all. After waking up at 4AM to bug bites I basically frantically made sure none of them got into my luggage for the last 3 hours or so I was there.
What did airbnb do? They "refunded" my cleaning bill and ended it at that. For 2 weeks I had to go through their support on the website only to be stonewalled or ignored. I sent them pictures of my hand that had bug bites, I sent them the text messages the owner sent, even though it was on the Airbnb platform. No dice. Finally I ended up getting through to someone via their Twitter account and was eventually able to get a refund for the night.
Of course I left a negative review on their page warning others about the possibility of being stranded if the previous guest forgets the key and also their lack of cleaning, but it got immediately buried by their algorithms.
That was about 4-5 years ago, never used Airbnb again.