My stay was awesome. I can't say enough about how wonderful my stay was.
1. Michael is extremely nice, helpful, and accommodating. For example, when I arrived, he had lots of suggestions for things to do while I was in Vienna. He also helped me secure a 5am cab to the airport (My German is awful, so this would have been difficult to do alone). Also, his washing machine was being repaired while I was there - he helped me figure out a convenient alternative. He's just the right balance of attentive but also leaves you to do your own thing.
2. The apartment is fantastic. It's spacious, comfortable, and clean.
3. The location is perfect. You can walk to everything. And public transportation is a 5-8 minute walk from the front door. Super-convenient.