Room for improvement From a SoMa rent-making scheme to a company worth $31 billion, Airbnb has grown up a lot over the past decade — and often clashed with its hometown. Brian Chesky and Joe Gebbia offer airbeds for attendees at a design conference at their SoMa bachelor apartment. Chesky, Gebbia and Nathan Blecharczyk found AirBed & Breakfast, brokering...