I feel sorry for every penny I've spent, mostly because I feel tricked into paying 30 euro for a full ticket, when in the lower Belvedere is practically nothing worth paying for.
After visiting museums all over Italy and London, this one is a real disappointment: way to expensive, no detailed info, really bad lighting. There are way better museums with free entrance!
I had the misfortune to buy the full package, including the 21st Haus, which has nothing to do with Belvedere. It's just rude and misleading to sell them together. Shame on you, Viena!
Save your money and skip the Lower Belvedere! The private garden is really dull and unimpressive. Even the Upper Belvedere is way to expensive at 12 euro.