Are you an environmental aficionado? Then this is for you! Hotel Topazz is Vienna’s first green hotel, and with 33 rooms, this modern hotel comes with strikingly round windows. The building itself is a very unique shape and the circular windows have built-in seats under the windowsills of the rooms. The rooms are spacious, with the attractive circular windows letting in just the right amount of light into the modern and finely decorated rooms. Bathrooms have a grey and white splattered marble on the floors and walls. The simple and royal purple lobby exhibits confidence and style.