Me and my friend have spent 4 nights in the apartment during our trip to Vienna. It is located in a very quiet area, near to the shops, parks and public transport. The place is really well-appointed, modern and cosy, we found there everything that we've been looking for.
We needed about 30 minutes to get to the actual center of Vienna, but public transport is really effective, so it is not a problem.
Moreover Wolfgang is a great host, friendly and communicative, ready to help and answer to any question!
Highly recommend! :)