I applied through a recruiter. The process took 6 days. I interviewed at Airbnb (San Francisco, CA) in Jan 2016
Interview
Three rounds. Mostly causal - My final interview was with my manager and another PM. There was an initial phone screen and then an interview with the team (three people at different times), and then a final interview with the manager over a beer.
Interview questions [1]
Question 1
They really really care if you are going to be a culture fit. Learn the values and get to know as much as you can about your team.