I had an excellent experience staying at Hannes. From the minute I arrived everything was easy. Hannes was waiting for me at the door. He always responded right away and was helpful in more than one way. When I asked him for a pharmacy address and what to get for a cold, he offered to go and get the medication himself.
The apartment was sparkling clean and very nice. The balcony overlooking an old mansion with a beautiful park is a plus. The area is quiet and safe to walk at night. A couple of buses stop at the corner (one takes you straight to the Opera), and one of the main Metro stations (Wien Mitte, where the fast train from the airport arrives) is 5 blocks away, a mere 10 minute walk. Also a couple of blocks away is a quiet part of the Danube river with lovely paths for walking or biking. You can walk to St Stephan in under 30 minutes or take the metro from Wien Mitte. There is a supermarket across the street and another one 2 minutes further down the road. A nice traditional cafe at the corner serves a variety of breakfast options.
One thing I liked is that the kitchen is equipped with basic things such as salt, olive oil, and some condiments, which allows you to prepare a salad or cook some pasta without having to buy a lot of things. There was also a variety of teas, some cookies and other welcoming details.
All in all, it was a great place to stay and Hannes was an excellent host. I would go back if I visit Vienna again.