Heinz' apartment was lovely for the 4 of us (traveling students). It is near westbanhof which makes it easy to get to, but means you also have to take the u-Bahn to get into the city centre (which is very easy!). The apartment building itself is a bit shabby, but the flat is decorated and kept beautifully. Heinz' sister picked us up personally and was very friendly. Overall a great place to stay in Vienna- would certainly recommend!