Al Tiramisu is a find, and those who have found it include George Clooney and dad Nick Clooney, Hillary Clinton, Magic Johnson, and Catherine Zeta-Jones. I imagine celebrities like it for the same reason everyone else does: the infectious ebullience of chef/owner Luigi Diotaiuti, who bounces out from behind a curtain to greet you as you enter; the unpretentious feeling of this snug little restaurant, which is essentially one long room in the bottom of a Dupont Circle townhouse (people do complain that it feels cramped, but I like it); and a menu that includes excellently prepared fresh grilled fish, house-made spinach-ricotta ravioli with butter and sage sauce, and veal Milanese. This is a place to come for romance, for cheering up, for having a good time with friends, and Tiramisu has been so obliging since it opened in 1996. Check out the restaurant’s website for a hint of its personality. A little hokey, maybe, but fun.