I AirBnBed an apartment a little more than a year ago, from a super nice, even slightly naive, owners. They instructed me to leave the apartment keys on the ki

I AirBnBed an apartment a little more than a year ago, from a super nice, even slightly naive, owners. They instructed me to leave the apartment keys on the kitchen table when I departure, and leave the door unlocked. "You see", the explained, "it's a smart house. We can control everything from our phones! The door, lights, stove tv -- everything!". They were proud of how advanced they are (naive, as I said), while I was a bit freaked out they (or their kids) would play with stuff in the apartment during my stay.