Frankfurt's Gerbermühle boasts every- thing one could desire in the German financial capital. Classical architecture (the building was a flour mill in the 1500s) is interspersed with sleek, modern accoutrements, handsome leather furniture and a 500-seat summer garden. Luxuriously situated on the banks of the idyllic River Main, the property even offers a sense of historical romance: It was here that Goethe met the love of his life.