Wendelin is a great host and kept in communication for my arrival into Viena.
It's an amazing flat in the heart of Vienna which you are greeted with- very modern look and warm feeling to the space. He had a little booklet prepared with recommendations if you have spare time or havnt planned your trip yet.
It has easy public transport options with the metro about 5min walk or less away. If you like walking though and the weather is good- I opted for about a 15min walk into the tourist centre and old town and easy walking distance to everywhere else.