The life of a modern-day nomad who hops from Airbnb to Airbnb every few weeks

It's been almost three years since Nick Doiron has signed a lease. As an app developer, Doiron, 26, can afford the insane rents in San Francisco, California. But he prefers the lifestyle of a modern-day nomad-no landlord, no furniture, no strings. Most of the time, he relies on home-rental site Airbnb, where he's booked 46 stays since...