Karl and Lisa's place is great for exploring Vienna! Despite being outside the city centre, it is a very short walk (less than 5 minutes) to the metro, which takes you into the city in 10 minutes. We only stayed for 3 days but got the 72 hour city pass with an app on our phones with an airport transfer and it worked great. There's also a grocery store right around the corner with anything you may need for the stay.
The description and pictures are definitely accurate and the apartment was modern and clean! You can also watch sunsets from the kitchen window :)