Mark T.
Yelp
Yay! Wiener Rathaus, you win the money!
It is definitely worth noting that tours are free (in German, but audio guides are available). I am also decently certain that you do need a guided tour to get inside, as it is a public building.
Some rooms and areas are definitely more I pressing e Than and average, typical city hall. This includes some of the stairways, and the festival hall (at least I think that's what it's called). The whole building is not like that, but then again, this is a city hall, not a museum.
If you do not care for city halls, but are a fan of other experiences...the ground floor has tourist information with plenty of maps and information.
If you do take the tour, and they do not show you, ask about the old elevator. A really cool thing to experience with the elevator "cars" going in a nonstop circle.
Overall, a great building and experience inside and out, start to finish.