Avis Charming apartment - Central Station

Came all the way from the United States to Milan, and had this stay confirmed by VRBO. I arrive at the property, only to have a mean security guard yell at me and telling me "that my stay was not valid." I then called the host, only have her say that "this stay is no longer available." I was then stuck in Milan without a place to stay. What a nightmare! AVOID AT ALL COSTS!