There aren’t many options in Karlovy Vary but Panoptikum is very good. If anything, you are guaranteed to be full from the sheer amount of food. Karlovy Vary as a town does not get too busy even during tourist season so I would not imagine having to wait very long for a seat if at all. The interior is like that…
Food was alright, not spectacular. The waiter was friendly at first, but after he brought us the wrong dish (twice the price we had ordered) and we insisted, he literally did not speak to us again other than direct one word answers.