I had a great stay at Daniela and Peter's beautiful flat in Vienna. Daniela and Peter are very super friendly and gave me loads of advice about where to visit. About 15/20 min by bus from the main train station. Trams pass their door frequently for the city centre. There are cafés and restaurants nearby. Also supermarkets within a couple of blocks which sell freshly baked bread and Viennoisserie. Buy your bus/tram/metro pass when you arrive at the railway station. Cheaper than buying single tickets.