Airbnb, the hot online room (and sublet) reservation startup, this morning announced that it has teamed up with business incubator Springstar to define a strategy for international expansion, confirming rumors that kept the German tech blogosphere busy the past weekend. Springstar was founded in 2007 by German entrepreneurs and angel investors Klaus Hommels and Oliver Jung, and Harish Bahl, who leads the incubator's operations in India and Asia Pacific. Springstar in a press statement said it will be providing strategic guidance in the expansion of Airbnb's international operations in select markets around the world, but did not specify which markets. It already provides such guidance to a number of companies scattered all over the world, including Russia's KupiVIP, Turkey's Markafoni and Brazil's Brandsclub. Airbnb competes internationally with the likes of Wimdu, 9flats.com, Crashpadder, iStopOver and CouchSurfing, with new competitors springing up almost daily. The company recently established its first European office in Hamburg after acquiring a German clone called Accoleo. Expect to see a couple more deals like that in the coming months.