This is without question the absolute worst experience I have ever had renting a property on Airbnb. The issue was the host's apparent disregard for the health and safety of their guests. We complained to the hosts about a serious safety issue posed by their non-functioning lock on the door to the apartment, which locked us in the apartment, unable to get out. The host's response was completely inappropriate and showed only contempt for our concerns and our experience of being trapped in their apartment. They were scornful and non-responsive to the complaint when it came to resolving the underlying problem and they seemed only interested in deflecting responsibility, both for their non-functioning lock (by blaming the guests for the problem) and for the health and safety hazard we pointed out to them, caused by the non-functioning door lock that trapped us in their apartment. Their answer to our expression of anxiety and concern that we could be trapped in the apartment during an emergency, such as a fire, was to say that their building has sprinklers and that we could simply jump out the window if that happened (though most of the apartment is a floor and a half above the concrete and cobblestone street below). The host's seeming disregard for us as guests (which is how we experienced their sarcastic communications with us in response to our complaint) and their apparent contempt for the anxiety their malfunctioning lock caused for us when we were trapped in their apartment was astonishing and disgraceful.