The 25hours Hotel Number One is housed in a 1950s office block. Its interior design features a retro mix from the 60s and 70s. The hotel is a dynamic, surprising addition to the west end of the city, where a large gasworks used to keep the lights on throughout Hamburg Altona. Each of the public rooms flows into the next, generating a communicative atmosphere throughout the hotel. Cheerful and colourful. Furniture, ambience, and lighting from the â60s and â70s. The 25hours Hotel Hamburg Number One is the birthplace of all 25hours Hotels and sets the standard for design and style. Close to the trendy district of Ottensen, it is the perfect starting point for city explorers and night owls. Before immersing themselves in the Hamburg scene, guests, neighbours, and suits meet on the terrace for burgers and chips from the cult Burger de Ville or to enjoy a view of the sun setting over the west of Hamburg from the roof terrace. The 128 guests rooms offer a cool retro feel and plenty of space for self-expression. The lobby is the catwalk for guests and visitors.Â The unusual interior design concept is one of the first works by the Augsburg-based design team Dreimeta, and was then further developed by Hamburg native, Sibylle von Heyden.