AZ 18 is a minimal penthouse apartment located in Berlin, Germany, designed by Iwetta Ullenboom. Located in the heart of Berlin, the penthouse apartment was refurbished and redesigned to create a new home for a young family of three. Housed on the 8th floor of a modern apartment complex, facing the Spree and the vibrant Friedrichstraße, it is a calm and serene refuge from the hectic city centre.