Hotel Sacher
Philharmoniker Str. 4, 1010 Wien, Austria
If you are in Vienna, you have to try the Sacher torte of Hotel sacher as it is where the famous cake was created!

25hours Hotel Rooftop Bar
Lerchenfelder Str. 1-3, 1070 Wien
If you are looking for a rooftop bar where to grab a drink, this is a great place. The place is modern-looking and design focused. The drinks are great and the food as well.