The kindness and flexibility of the personnel at the front desk deserves a 5 star rate. I have traveled extensively around Europe and made a mistake in my booking, I arrived one day later. The manager granted me an extra night afterwards, so I could stay in Wien enough time and made up for the night I had initially lost.
Beautiful room and clean. A little bit off center but in a nice area and only a few blocks from the subway station, therefore it was very easy and comfortable to get to the center. I would book the same hotel next time.