The apartment is very close to the city center : 15-20min with the transports and 25min with a citybike (we are slow riders). It is also very close to Schönbrunn (15-20min walking). The neighbourhood is quiet and you can find supermarkets and restaurants around, the tramway station is very close and the citybike station as well (trust me : the best way to discover Vienna for a really cheap price !).
The apartment is small but there is everything you need and it is very clean and cosy. We loved our stay in Vienna !