I'm a writer and teacher of writing at the New School in NYC. Nowadays I usually use airbnb for work, either for research trips, or sometimes just to have my own place to live/work in for a week or two. I share a very small apartment with my boyfriend, and he's also a writer, which means we both work at home. When there's a tight deadline involved, this really really doesn't work very well. But most of the time, we get along surprisingly well in this Habitrail-like space, so we're not motivated enough to get a different, bigger, more expensive apartment.
I also often travel to London for publishing stuff, and to visit friends (I lived there for 18 years). So far, my friends in London haven't let me use airbnb on these trips, either because they actually like having me stay, or because the idea of the wasted money is too hard for them to deal with. But that does suggest that I'm a good guest. (I'm personally a little tired of the staying-with-friends thing, after many years of it, but then I'm the one who has to sleep on the couch.)