Airbnb has completely banned hosts from installing indoor security cameras, ending a previous policy allowing surveillance in living rooms, hallways and other shared spaces. Until now, hosts could set up cameras in their homes as long as they were clearly visible and the visitor was informed before booking, however from April 30 onwards, only outdoor cameras will be permitted, according to a new policy announced in March. Airbnb will, however, continue to allow sound level meters, devices designed to help recognize if a guest has staged a party, which is generally prohibited. Guests must also …