Roland and Aniko's place was amazing! It was a perfect size for just the two of us and it was absolutely beautiful. We had a few changes made to our plans due to airlines issues, but Aniko was extremely accommodating and emailed me back right away which took away any stresses of getting there.
The apartment is very close to a few restaurants (Vindabona was our favorite) and the Augarten park is extremely close. The tram is literally one minute from the door. You have to catch the 5 for a quick and very easy way to get to the subway station of U1 and U2, a direct train to and from the airport, and just the easiest access to the city center!
Although we weren't able to go, Praterstern (you're "home" base for a subway station), is close to Praterdom, a hip club just in case you're into a fun night of dancing. It's also surrounded by the amusement park (Praterdom is in this amusement park), and their famous Ferris Wheel which is fun for all ages!
Honestly, we couldn't have chosen a better place to stay in Vienna! Definitely worth it!