Two bad things in Czech

I come across to bad things in Czech. First one is about money exchange, second is about restaurant here.

Today, I was out of cash and I have to exchange some more CZK. Since today is Saturday, all the Bank is not opened.

I went to a local money exchange agent to exchange my 100 Euro. They changed to me 1,659 CZK. I forgot to bring my previous statement to check the rate.

After I checked the rate when I back to hotel, I found my statement that recorded the money exchange rate from a local bank yesterday. I realize that 100 Euro should change me about 2,300 CZK. What's the hell the profit margin is so high for the money exchange agent?

I never change money again in such local agent forever!

Another story is about restaurant. I was seeking restaurant last night and entered one restaurant near the old city square. I picked the menu by myself and the waiter asked me to take a seat anywhere I want. Then I sat there for 5 min without anybody came to take the order. What's next? I left.