In less than a decade, Airbnb has gone from having a single listing, for an air mattress in founder Brian Chesky’s living room, to having nearly twice as much room capacity as the largest hotel chain. The home rental network has 60 million users and a $24 billion valuation, making it the second most valuable startup in the world behind Uber. Airbnb has so far managed to brush off potential impediments such as regulatory challenges and the…