There are two cloisters at Santo Stefano and a covered passage connects them. The window is located in that passage.
There is another window on the opposite wall that looks into Rio del Santissimo going under the church of Santo Stefano.
One can visit the remains of the old cloister from the XIV cent. and the late Renaissance cloister that once had frescoes representing Scenes from the Old and New Testament, by Pordenone. What remains of those frescoes can now be admired on the third floor of Ca' d'Oro.
