Excellent flat. A really easy and comfortable place to stay, while also full of character (plants, paintings... lots of cool stuff). Everything you need to live is there.
Vigo is great. He came along for check-in, and introduced me to the flat. He kept in touch in a kind way.
The flat looks out on square with trees and little fountains, and is five minutes walk from the Augarten. Fifteen minutes walk takes you pretty much into central Vienna. There are supermarkets and shops just around the corner.
Overall, a really easy flat to live in even for an extended period of time (I stayed for three months) in a great location.
Strongly recommended.