My stay at Denys place was amazing. Appartament was very clean and well prepared for my stay. Location is pretty perfect, very close to the St. Stephen's Cathedral. As well all the necesary public transport is nearby, so you can easly get to other historical buildings or go to Donauinsel for a swim (you can get everywhere by foot, but just in case you are lazy walker).Deny is a great host and really easy to communicate with.
100% recommended for others!