In a span of 11 years, Airbnb went from being a company that rents 3 mattresses to a company that counts 150 million users, arranges 2 million bookings per day, and whose value is estimated at $38 billion. To help you understand how Airbnb achieved such a huge success, we’re taking you back to 2008, when Airbnb provided the people with a clever way of earning extra money off of their homes as the housing market was crashing.