We had a lovely stay at Anja's and Christian's. The room was very clean, stylish and had everything we needed. It's really well located, within walking distance of all the main sights or a 5 min walk from the metro station if you wish to go further afield.
Christian was an excellent host. His directions to the room were perfect and he kept in touch throughout our stay to make sure we had everything we needed. He even looked after our luggage for us on our last day as we had a late flight. We really appreciated not having to drag our suitcases around all day!
Highly recommended. We'd definitely love to return to Vienna as there's so much to do, and we'd certainly stay here again.