Both are psychologically completely different. With CS, you don't just crash the couch. You hang out with the people, you get dinner together, you talk. And I t

Both are psychologically completely different. With CS, you don't just crash the couch. You hang out with the people, you get dinner together, you talk. And I think most of the time, with CS you hang out only for a night or two. Longer stays might be awkward, since you don't know the person in advance. With Airbnb, the whole thing is less about the social interaction and more about a place to stay. In several occasions, I didn't even meet the host of Airbnb. In another occasion we had a BBQ together, which was really nice. The "advantage" of Airbnb is that you, as a guest, can psychologically expect to be left alone, since you pay for the room. This enables stays of a week or longer, not only a couple days. It doesn't matter as much, if the host is awkward. I like both, but I'd use both on very different occasions.