I've been in AirBnB hosts where the landlady would make deserts for us and all kinds of stuff, just because she was nice and bored. We enjoyed it very much and I would tip her via AirBnb - she didn't want cash, except once - pre-agreed for multi course meal where she fed a group of 4, and it was pretty much just for the resources.
There was a guy in SF that took me around shown me the city, etc... I enjoyed this too and would tip him.
I have more examples of that.