Ignore the previous reviews this is a very nice Cathedral. Especially early in the day before the crowds arrive. Great art and lots of photo ops, please don't use a flash.
3 Kuna to light a candle and 15 Kuna to climb the bell tower. Well worth the climb up the rickety steps. Don't look down. The view from the top is awesome I went up there for mid day to see the bells ring, very load. Loved watching my wife slowly decend the steep steps.
As you can see it from all of rovinj you have to go and see it anyways. Enjoys