I'v stayed in this flat for around two months. This flat is in a great location on the 20th district, just nearby Augarten, and very close to the river, and over to 9th. Easy to walk even to centre of Vienna. You can take the tram to Praterstern, or U4 to central if you like.
Flat has everything you'll need. High ceilings really make a lot of difference. Bed is quite comfortable, and the neighbourhood is quiet and peaceful. My guests also found the sofa bed comfortable. Kitchen is a bit small but I didn't find that as a problem even for two months of almost cooking almost every weekday.