... it is more expensive than Germany.  I wouldn't go all the way to Vienna just to go to GT.  But, if you are already in Vienna on business and don't have to worry about bumping into colleagues, GT is the best bet.

An alternative is Maxim -- the strip club/brothel.  Entrance is free, you can try before you buy, and €200 will get you a room upstairs with a girl of equivalent quality to anything at GT for an hour of GFE.  It's definitely a good deal if you're only interested in (or capable of) one pop.

Did you go??  How was it?  In Vienna soon and wondering if GT is worth a try or if I should stick with room service