Many many rounds, be prepared for around eight rounds of interviews.
From my memory:
First round is with HR,
Second - Forth rounds with team manager and future team mates,
Fifth - Sixth rounds with non-team mates,
Seventh - Eighth rounds - cultural fit interview
The interviewers don't really share notes with one another, so there may be some repetition in the questions.
Interview questions [1]
Question 1
Many scenario questions, where they would give you work situations and ask how you would behave.
I applied online. The process took 2 weeks. I interviewed at Airbnb (Dublin, Dublin) in Feb 2014
Interview
One hiring meeting event with other candidates. Very casual interview procedure with self representation and group tasks. Two skype interviews afterwards which are just a quick chat who you are and why you like to be at airbnb
Interview questions [1]
Question 1
Keeping online for the skype interview as it was life with San Francisco and the connection to the HQ is very poor
I applied online. The process took 1 week. I interviewed at Airbnb (Singapore) in Aug 2016
Interview
Applied online and got a followup email not too long after. Scheduled an initial phone call, which took around 40mins. Got an email for the next step the day I had the phone interview and few days later video interview was followed.
I applied online. The process took 8 months. I interviewed at Airbnb (Portland, OR) in Mar 2015
Interview
From initial application to hiring took 8 months. After submitting my application and resume, I was asked to record a series of videos to submit. Then there was a group interview or "hiring meetup". Finally there was a Skype interview.