 Honestly nothing Maybe would have been great that the sound in the bathroom would have worked but honestly this is a minor point And we managed it with the radio from the TV
 Excellent and central location Gorgeous buffet breakfast An incredible wide range of choice of everything you can even not imagine Japanese miso soup Arabic humus etc home made mortadella freshly pressed juices cheeses fruits good Stauds jams nuts grains pastries and dishes they can prepare fresh benedict eggs we came for our wedding anniversary and they offered us a bootle of Sekt which is very keen room was very comfortable we slept very well quiet and dark Grand Hotel is one of the most beautiful classical hotels of Vienna especially good price quality relation Others might be nicer but much more expensive You might feel missing space in the corridors but you should have enough in your room 4m ceiling height 