We highly recommend Robert and Margit's apartment!
It was clean, modern, comfortable with all the facilities needed, even for a longer stay.
Robert was extremely helpful, understanding and overall an awesome guy - a great host!
Also worth mentioning is that from our experience the apt. is family friendly - our toddler had a great time.
Location is good - with connections to almost every form of transportation in Vienna (subway, tram and bus).
5 stars!