Serendipity

Once you have identified the campanile (and it's not San Stefano's), it should not be too hard to find this rio, which was remarkably peaceful for a Saturday afternoon last September. Alternatively, you could google the name of the osteria on the awning on the right.
I was delighted to find that the far end of this rio was a location from Brideshead Revisited (TV series) that I had been looking for for quite some time.