First there is the Inner City ("Innere Stadt" or "1st District"), which is – you guessed it – right in the middle of everything.
Inner City is completely surrounded by the famous Ring Street ("Ringstraße"). It's home to a lot of the sights you’ll want to visit.
Outside of Ring Street are the districts 2 to 9, which by themselves are – also quite logic – surrounded by the bigger Belt Street ("Gürtel"). Further out are the districts 10 to 23.
And if that weren’t reasonable enough, the city’s landmark cathedral Stephansdom is right in the center of the Inner City itself.