So...what happened with airbnb? (spoilers)
Both Keith and Tess were booked at the same time. Justin said nobody was supposed to rent the place for over a month. Are we supposed to believe that Tess survived a whole month in the tunnels drinking milk?
Did other guests end up in the basement? Their belongings and cars disappeared each time and the keys were left back in the box? Seems very far fetched.
Also, renting a house that has a basement door which locks you in seems very dumb. I can see why the maniac installed it, but it would have been changed when the house was being renovated.