This sort of thing is bound to happen when you have helped over 1 million stays between two people who are usually strangers. I think what's more impressive is how long it took for something this big and this public to happen. Human beings act in strange ways and you take a risk anytime you interact with one. I feel awful that this happened to this woman but I don't think it means Airbnb has a flawed business model or needs to dramatically change the way they sign up users.