I think the Ferdinand's house is the best in Wien. The apartment is very central in pedestrian area in the same street of Hotel Sacher. You can also reach the Opera, Stephansdome and Hofburg by feet and in two minutes Metro Station Karlsplatz with 3 lines of metro and bus and tram. The apartment is WONDERFUL, very clean, giant and wide, full of amenities, conforta and every mod cons, even the two Wi-Fi lines to cover the the line in the full flat. Ferdinand is a fantastic host and was very helpful and kind. The contacts with him were always very quickly. In a nutshell it was a perfect staying under every point of view. If I and my family return in Wien we'll certainly choose this beautiful home. Thanks again Ferdinand.