Bücher Kuppitsch

While they may have a very nice selection for a non-chain bookstore, it's not exactly overwhelming.

I still prefer Thalia.

but books on waffles! even a water dispenser, which isn't standard in vienna.

it is big enough to find almost everything you care about but not so big that you would get lost in it. folks there don't mind if you just sit down and read in a book without buying it, which is really cool.