On the plus side, it's a fabulous flat and very convenient for the sights (and seconds walk from the Naschmarkt). It's spacious and much of it looks quite new.
On the downside, we did have some issues with the services - the hot water was not adequately reliable to be able to shower (owner provided access to another flat to use) and the dishwasher didn't work initially (they arranged someone to fix it). On both points the owners were very responsive and helpful but it did mar the stay somewhat