In May 2011, Airbnb acquired a German competitor, Accoleo. This takeover , as well as other similar acquisitions, launched the first international Airbnb office, in Hamburg .  In October 2011, Airbnb established its second international office in London .   Due to the growth of international users , in early 2012, Airbnb opened offices in Paris , Milan , Barcelona , Copenhagen , Moscow , and São Paulo .  These openings were in addition to existing offices in San Francisco , London , Hamburg , and Berlin .  Airbnb announced in September 2013 that its European headquarters would be located in Dublin.  Prior to the 2012 Summer Olympics , Airbnb acquired London-based rival CrashPadder, subsequently adding 6,000 international listings to its existing inventory. This acquisition made Airbnb the largest lodging website in the United Kingdom .