It seems some people have had good experiences here. My experience was bad. It's a tourist trap. 21 euros for a bellini. (I saw bellinis on one of the outer islands for 6 euros, though didn't try one there.)
The bar was cramped and crowded. I was standing at the bar wearing a small back pack, which I realise was amiss of me. A waiter came past, poked me and said "bag", one word. I didn't realise, then, what he meant, so shrugged my shoulders. He repeated "bag". Then the penny dropped, I apologised and removed my bag. But I was furious that he could have been so rude, that they can charge the earth for drinks and treat their customers with such disdain - no "Excuse me, sir. Would you mind removing your bag as it's causing an obstruction". Maybe I'm too British but I expect more courtesy. Maybe it's because they charge so much and people still crowd in there that they think they don't need to bother to be polite. Like other reviewers have said here, don't bother.