We (me and my 70-year old parents) spent a mini-holiday weekend in Eva's and Michi's apartment and the flat was perfect for our needs: it was spacious enough to give us all privacy but also homely, clean and nice (actually the right word would be beautiful) for spending an evening together at home. The apartment is well equipped with everything you need and it is quiet but yet very close to city centre, and we could walk everywhere (or take a tram/metro if needed). I would definitely stay here again when visiting Vienna!