‘Goodness Triumphant’ is the subtitle of Rossini’s La Cenerentola, and you’d better believe he delivers. It’s the sweetest thing imaginable; true, the stepsisters are awful, but their spite bubbles over in streams of such sunny major-key effervescence that it’s hard to hold it against them. As for their father Don Magnifico, you can’t seriously hiss a villain whose principal ambition is unhindered access to the palace wine cellar.