I can't stress enough how wonderfull my stay in Vienna was. Martin and his girlfriend are extremely nice and helpfull.
The flat is beautiful, better that the pictures, you have everything you need for a long stay. I was here 6 months and it was very enjoyable. Near the Hernals train station (S45) and near the tram 43 that takes you to the U6 and U2 subway.
If you are looking for a nice, comfortable place to stay in Vienna, here is your place.