okay, our flat is as central as it can be! there is public transport (bus, tram, ubahn) right in front of the house. a billa-supermarket is in the same house, too (so you can get your breakfast there or in several cute cafés next to my place).
if you want to go sightseeing: have a walk to the university (4 mins), to the huge gothic-townhall (8 mins), to the "hofburg" (8 mins), to the "stephansdom" (18 mins walk through the beatiful 1st district) and many more on your way.
you will love vienna :)