You never miss the water till the well runs dry

Or, in the words of Joni Mitchell, You don't know what you've got till it's gone. Let's hope we never have to say that about Venice.

Here's another scene that you should be able to find fairly easily from that partially hidden nizioletto. If you'd like another clue, it's very near to the narrowest street in Venice.
This is one of the nicest well-heads in Venice, in my opinion. I was fortunate enough to be there when the leaves were just changing from green to red.