This is a perfect location if you're arriving or departing by train! But, it's also great if you're not.
We arrived in Vienna just for a day (by air) before departing the next day by train. It was a very easy train trip from the airport to the main train station (also a subway station) which this hotel is *directly* across the street from. We were lucky enough that our room was ready a couple of hours before regular check in, dropped our bags, and then went to explore the city by metro and on foot. All of it couldn't have been easier!
The next morning we had time to enjoy the fabulous breakfast before our departure: outstanding variety and quality of food and drinks: eggs, meats, pastries, breads, yogurt, waffles, fruit, cheeses, cereals, juices, coffees, you name it!
I would absolutely stay here again and recommend it to anyone visiting this lovely city!