This narrow little room across the river from the National Theater is home to some of the city's best sushi, courtesy of the fish market next door. The selection is first-rate by Central European standards. And beyond sushi, the menu also includes a great seaweed salad and a rich vegetable stew. Though prices for individual pieces of sushi start relatively low, the bill can rise quickly, depending on how many you order. The space is tiny so try to reserve in advance.