Our room was located on the 1st floor of the traditional building housing the Opera Suites. It is just across the road from the Opera House, 2 minutes walk from U-bahn Karlsplatz, 5 mins each from the Hofburg Palace, Museum Quarter, St. Stephen's Cathedral and located at the end of the main shopping street Kartner Strasse.
Our room overlooked the Opera House. Despite it's busy central location, although there was some noise (New Year's Eve) we were never distrurbed. We had the standard double room. It was spacious, well furnished with good storage and included crystal chandelier, free fast wifi, excellent tea / coffee facilities, great en-suite bathroom.
The bed was large and very comfortable. Well heated during this cold winter period but with air-con for the summer.
The staff were extremely helpful, very nice to talk to and spoke excellent English.
We were able to leave our luggage by the reception on the 2nd floor on our last day until we left for the airport.
The location of the hotel meant that the transfer to the airport by the very cheap U-bahn / S-bahn ticket was quick and simple.
The area around the hotel has some of the best restaurants and coffee houses in Vienna, so there was no difficulty in finding great locations for traditional Viennese breakfasts and evening meals.
We felt very safe and comfortable here.
We will definitely come back to this hotel as first choice when we return to Vienna.
There was really nothing to dislike, just some things to point out. Firstly the Opera Suites is not a 'full' hotel - there is no breakfast area, although breakfast can be arranged to be brought to your room. We didn't try this. It's not a problem at all as (see what we liked) it's so well located that actually going out for breakfast was part of the enjoyment.
Secondly, it's a bit difficult to find when you first arrive. It doesn't have a grand entrance, just a doorway in the middle of the building with a small notice to the side saying Opera Suites. Look for the Starbucks on the corner of the block.
Thirdly, the reception is on the 2nd floor and rooms on the 1st and 2nd floors. There is a very small lift (3 people max) and a curving fairly stark staircase. We were slightly put off by this when we arrived, but don't be - it's a great place.