As Airbnb makes its public debut, Greylock general partner Reid Hoffman looks back on the past decade of working with the company. Greylock led Airbnb's Series A in 2010. Hoffman initially heard the company described as "renting couches," so he passed at the first opportunity to invest. But later conversations with early investors prompted Hoffman to meet with Airbnb founders Brian Chesky, Joe Gebbia and Nathan Blecharczyk. Within two minutes, he decided to partner with the company.