The Topazz design hotel by BWM Architekten und Partner in Vienna’s city centre can be likened to a glistening, dark-coloured gemstone. Its brown mosaic façade, which absorbs and reflects the natural light, ensures that this building – on one of Vienna’s smallest building sites – is a real eye-catcher. The design, created by BWM Architekten und Partner, is characterised by striking elliptical window openings that jut out slightly.