We had an absolutely great time staying here! The room is a good size, with plenty of bed space for two, and even has a fun dining table with a pull out bench if you ever happen to be working or eating at home. It is also really well-heated so you don't have to worry about colder nights and everything was cleaned, with fresh bedding, for our arrival.
Claus is also a lovely, accommodating host - always responding quickly to any questions we had before or during our stay. We arrived quite late on our first night and he stayed up to welcome us anyway and make sure we were comfortable. The whole flat is available to you, so you can cook if you want and even have shelves made free for you in the fridge.
We chose Claus's place for its location, perfectly between the city centre (30min walk or 10 min subway) and the Arena Wien concert hall (only a 15 min walk), which easily let us explore Vienna on foot; however, it was the overall homeliness and kindness of our host that made this stay especially worthwhile.
We recommend this place to anyone looking for a city stay in Vienna and will definitely be back.
Thank you, Claus!