My family and I stayed in Cristina's property for 7 nights over the Christmas period. It is a lovely, spacious apartment, located in a nice area and surrounded by supermarkets and restaurants. Volkstheater U-Bahn station is about an 8-minute walk and from there you are just two stops to the very centre of Vienna. Therefore the location is perfect!
The apartment is very comfortable and well-equipped with all necessary appliances. During our stay we had one minor technical difficulty but the hosts were extremely helpful and responsive, and went to great trouble to sort it out quickly. Communication with Cristina was very good throughout our stay and she was always quick to respond to questions.
Overall a very pleasant stay and we couldn't recommend it enough!