I thoroughly enjoyed this. Most Snarry writers use the 'we both had horrible childhoods and that will give us common ground' device at some point, but it was gratifying in this story to see Snape witness it, and identify in reality. Flitwick was so strong in this, and Poppy too, but I fell in love with the wise Nonna, mourned for Snape's leg, but was filled with warmth over the prospect of a different childhood for Harry, in such a wonderful environment, your Italy.
Dumbledore was chilling in this, and yay for Lucius doing his best for his friend in the end. And I think that mentor relationship is about to kick into high gear. Poor suffering Snape, he deserves some happiness, and I think it/Gianni just knocked at his door! What a satisfying story!