This hotel should be the world standard : zero-energybalans, greenroof, green walls, renewable energyproduction, FairTrade & biofood. Fantastic to find this on 20 min walking from the historical centre of Vienna. Rooms are very clean, handy and nice (modern). Rooms-with-a-view on a purple lavendula-roof : you even smell the fragrance while sleeping like a rose in a very quiet neighbourhood. 5 min from lots of restaurants, a foodstore just at the frontstep. Staff is so kindly. I was here for business, and I'm staying in dozens of hotels around the world, but the staff is so friendly, even with the spontaneous printing of the boarding pass. I'll be back!