Palmenhaus is absolutely gorgeous. Although it was warm enough to eat on the terras, we prefered sitting inside to enjoy the beautiful greenhouse with the plants. Absolutely a top location to have lunch. I had asparagus with salmon and my boyfriend chose a Wiener Schnitzel. Food was ok, but nothing special. The food arrived rather quickly which made me think it was just heated. Service was friendly and correct.

Palmenhaus, Burggarten 1, Vienna 1010, Austria
http://www.palmenhaus.at/
+43 1 5331033

Visited June 2014. You can find my review about Palmenhaus also on TripAdvisor. My scores: value 4/5, atmosphere 4/5, service 3/5, food 3/5.