My stay at Osman's flat was very good. The location was perfect, right next to Kärtnerstrasse, Hotel Sacher, the Albertina and a 5-7 minute walk to the Stephansplatz U-Bahn. He was very accommodating, he stocked the kitchen with essentials and made me feel very at home. The 7am church bells also acted as my daily alarm clock but I didn't mind since I was there for work. I recommend his place.