Martha's flat was great and exactly everything my parents and I needed for a few nights in Vienna! It's located on a nice quiet street, and within a 5 minute walk to a subway which will get you to the city center in a couple minutes 1-2 stops away. Also nearby is the famous Naschmarkt, which begins right next to the nearest subway station and leads you towards the city center. We didn't get to meet Martha unfortunately, but fabulous experience all around!