Airbnb is a growing phenomenon as people rent out their homes and apartments as an alternative to hotels: often giving visitors more room and costing less than hotels. (For the record, we recently used Airbnb to rent a house in California) A recent case in Madrid has shown the inherent danger in such sites. On July 4th, Jacob Lopez called his mother on her cellphone in a desperate call for help. He said that when he arrived at his Airbnb, he found his host in the apartment who locked him in a room and demanded sex from him. The mother, Micaela Giles reportedly tried to get Airbnb to act but they refused and told her to call police.