Achieving a zero-energy balance, this hotel makes the most of solar power, rainwater collection and LED lighting, and has a roof planted with fragrant lavender. Vivid shades of purple, pink and peach enliven the 79 vintage-meets-modern rooms. They're split over two buildings divided by an ivy-draped courtyard where organic breakfasts (including honey from its rooftop hives) are served in fine weather.
Boutiquehotel Stadthalle
Top choice in Vienna