A converted 19th-century gasworks, the Gastwerk Hotel turns the heavy industrial architecture of this power station into a lofty haven in the harbour city of Hamburg. Floods of natural light, backlit panels and balcony lounges add airy touches to a solid frame of raw materials and original brick walls. Black-and-white photographs of the former architecture, soothing textures, the creative yet down-to-earth restaurant Mangold and the rejuvenating Gastwerk SPA give this once purely functional space a spacious and good-looking new lease on life. And for those who need to work here, there is the light-flooded meeting and conference area called Denk.mal. Sophisticated!