Guido takes his daughter Isabella to study at the House of Calvierri school in episode 5x06 "The Vampires of Venice".
Source: The Doctor Who Locations Guide
Some outside areas of the Monastery as well as the main living room where the meetings between the regular crew and their doppelgängers in episode 6x05 "The Rebel Flesh". From episode 6x06 "The Almost People".
From episode #203 "The Voyage of the Damned".
From episode #403 "Land's End to Porthcawl".