I stayed here for about 3 months while working in Wien. Beata is very helpful and responds to messages quickly. Her sons helped with check-in and other things I needed.
The flat is a studio ideal for one person. It was very clean when I moved in. The kitchen area is a little tight if you're planning to cook, which I rarely did. Also, note that the dryer downstairs is not very effective.
Location: You'll be in a very quiet, safe neighborhood. Public transit is right outside your door, though the city center is a little further away (on average 30-40 minutes).