The guest room at Sibylle's place is a lovely, cozy little space in a beautiful old building, in a very quiet, convenient part of town -- it feels far from the tourist crowds, but it's close enough to walk to most of the major sites, and the U4 (and a Spar supermarket!) is a two-minute walk away. Sibylle herself is a very kind and interesting person, and we had some really nice chats in the mornings and afternoons before I headed out to see the sights. She also gives great suggestions for things like where to go on a nice walk or try traditional Austrian food! A perfect place to stay for a solo traveler to Vienna.