The location of Cloud No. 9 is perfect, especially for those first visiting Vienna. Located just across the canal from Schwedenplatz and the U-bahn subway stop, and 3 blocks from the Vienna Airport bust stop, makes it a great spot! Numerous restaurants nearby, and Emil has listed some examples in his welcome book. You are less than a 10 minute walk away from St. Stephens Cathedral for example, and so many other great sites in the historic 1st district. The subway/bus/tram access and reasonable prices get you safely anywhere you really want to go in the Vienna city area. The Airport bus is 8 Euro one way, or 13 return trip, and runs even 1/2 hour, 24 hours a day. You really don't need to rent a car!
Enjoy the comfort of the apartment, and its quiet setting, as it is in the second building set back from the main street. Enjoy!! Cheers, k n b.