Have stayed in the Ocean apartment for 4 nights with my wife.
Easy key retrieval (locker box), clean apartment (though with a few worn-out furniture pieces). Spacious, large balcony, very comfortable bed, very fast wifi.
A minute away from a tube station and tram station (brings you to the historic centre in 10 minutes).
Well heated (it was very cold outside), obviously air conditioned in summer.
The only thing we missed was a micro-wave in the kitchen, and maybe an additional tv in the bedroom.
But definitely a good choice for a stay in Vienna!
- Free Wifi