I can wholeheartedly recommend this flat for your stay at Vienna. Me and my wife found it super comfortable, beautifully decorated and equipped with everything needed even for a long stay. Great bathroom, cozy beds, a lot of storage space if needed, and everything super clean. One thing to keep in mind is that there is a stair there (better not get drunk ;)
Christian was very helpful and attentive to our needs and we are very grateful for his hospitality.
Totally recommend!