I only stayed here one night, and it was exactly what I needed --- the ultimate location, literally surrounded by the fantastic monuments and buildings of Vienna's grand central district. Step outside into Michaelerplatz and be visually confronted by awesomeness.
The apartment is pretty spare. Entry hall, bedroom, bathroom with shower. And a coffee maker, which is a nice touch.
If I was staying for longer, I probably would have appreciated some warm touches such as more art on the walls or some soft rugs on the floors. Maybe a microwave would have been nice to heat up my coffee after it gets cold or whatever.
All in all, though, it was perfectly adequate for my simple needs (sleep, shower) and the location was ABSOLUTELY TERRIFIC!
Note that the check-in seems a bit complicated at first but if you read Dan's very thorough instructions, it makes perfect sense. Also, his communication is great--almost instantaneous---so if you have trouble, he's there to help.