 Tiny criticisms English Tv channels limited but no problem for me not in Vienna to watch tv Lack of decent light around mirror in bathroom for shaving 
 A good clean hotel in a quiet location Stayed in June during period of hot sunny weather Room type Single Business Class has queen sized bed Room variable aircon works great and really cooled the room well a real bonus for a comfortable nights sleep Not many Vienna hotels in this price range offer this feature Breakfast is a wide and varied buffet cooked eggs and bacon cold meats cheese cereal fruit breads etc juice and coffee There is also a comfortable bar leading onto a small inner courtyard terrace Staff are super friendly especially Sophia on reception but its unfair to single out one they are all great Room and Bathroom very clean bed comfortable and made up every day Safe works with door pass card Stocked Fridge in room Nearest Tram stop is a 5 min stroll down a quiet side street part of the excellent city Tram and Underground network In summary without hesitation I d recommend the Hotel Boltzmann and will definitely stay there again