When you go to the train station in Venice, you can choose to use a walkway/ramp, tucked away on the right side of the station. It’s not at all obvious, and is overlooked by many people who struggle up the stairs with their burden (heavy luggage).
I’d read that behind the wall you’ll see to your right as you walk up the walkway, is the Centro Scalzi. I can’t find out much about it. They do have a Facebook page, but the most recent communications were from November, 2012.
One morning when I was catching a train to Padua, the gate in the wall was open, and I caught a tiny glimpse of what is inside.
They do seem to hold courses on art, particularly that of Tiepolo, and also with Saint Teresa as the subject.