O—183 is the extended space of Hidden Fortress studio, located within the historical Oranienhöfe in central Berlin Kreuzberg. The roughly 75 m² room functions as a showroom for furniture developments, a showcase of partner brands, and a rentable venue for pop-ups, exhibitions, meetings and events. The space includes a fully equipped kitchen, multimedia screen, fibre optic internet and various furnishing options. A separate unisex restroom is available for users of O—183. Designed with emphasis on natural materials and warm tones, the space reflects the studio's philosophy of thoughtful interior architecture.