"the iced-cake front of the Gesuati"
Facade of the Gesuati, viewed from the Giudecca Canal
Creative Commons Attribution Share AlikeFacade of the Gesuati, viewed from the Giudecca Canal - Credit: Waysider83

Founded by Jesuates (not to be confused with Jesuits), the 18th century church of Santa Maria del Rosario, commonly known as the Gesuati, stands by the Giudecca Canal, on the Zattere where Miss Garnet first takes lodgings. It is no. 14 on the map at the back of the book (Afterword p.7).