Lots of great things about this apartment - comfortable, warm, well appointed, clean, good internet. The best thing for us was the location. The apartment is a 10-20 mins walk from most of the city centre sights and most other things are easily accessible on the metro, and Karlsplatz station is a 5 mins walk away. The apartment is just outside the centre so its also quiet. Many reviewers have mentioned its close proximity to the Naschmarkt, which is fun to visit for its stalls selling local produce - we had the local kasekrainer sausage and gluhwein there. However, Naschmarkt is quite touristy and if you fancy a more authentic experience we loved the Breakfast Club and Vollpension nearby - thanks Alex for the recommendations. Better prices and service and you can have your coffee alongside local people and their families.
The apartment doesn't have a TV, but that didn't bother us. If you are over 6ft you may struggle a bit with the shower as its not that high, but don't let that put you off.
Lovely apartment in a fantastic city!