This apartment was great. Perfectly located for the Albertina, Opera and central Vienna. Very quiet area even though it's close to everything and there's a nice bakery round the corner. Could ask for more.
I didn't meet Osman myself but check in and check out all went smoothly and there were a few nice touches to welcome us.
I have used Airbnb a lot over the last few months and this apartment and Vienna were one of the best I have encountered.