Anna Lena's house is very spacious and very well equipped with everything you need (in the kitchen and in the bathroom). There's no air conditioning (you are on the 4th floor). It's a 5 minutes walk from the U3 and U6 metro station Westbahnhof from which in another 5 minutes you are in the city center. You have some mini markets nearby (Billa, Penny Market…).
We left our car in a P+R on the U3 line (Kendlerstrasse), so it was perfect for our 4 days stop in Wien.