Chenfu's hospitality was unbelievable. I arrived quite late at night, and with a cold - Chenfu waited up to greet me, even offered to pick me up from the bus station and supplied me with some noodle soup when he learned I was sick. He also gave me a perfect explanation of how to use the subway and what to do with my limited time in Vienna.
The apartment itself is very spacious, very clean, has everything you need (free coffee, tea, laundry detergent etc), and is a short walk to the subway where you can get anywhere you need to go (Vienna has amazing public transportation).
I would highly recommend staying at Chenfu's house, and wish I could have stayed longer.