We really enjoyed staying at Ben's apartment. It is quiet, clean, and very well located. We found it easy and fast to get into the centre and to tourist attractions. There were many good places to eat and explore around the apartment too. Apartment has all you need for a couple staying in Vienna.
Unrelated to his apartment but for those new to Vienna be warned that all supermarkets close at 530-6 and are not open at all on Sundays! We were going to cook food in the apartment one night and found we couldn't because er couldn't buy any anywhere!