You need to give more details about the situtaion.
Why did you need to change the locks, like why you were worried about security?
Still, I believe that Airbnb should definitely provide legal support for the safety of homeowners. Last year, I was threatened several times by a guest with psychological problems. He left a knife in front of my door and kept threatening me.
I explained the situation to Airbnb and submitted my complaints to the police. What was the result? They did nothing, they didn't even get back to me after the police records. It was interesting.
h4wksq7a1