You know how those cravings go: Must. Have. Cafe con leche. And a Cuban sandwich. NOW. That's why the 24-hour window at Havana Restaurant has saved many lives, from the night crawlers leaving Clematis Street to the early-birds needing a pick-me-up on the way to work before dawn. We usually get our fix with a banana batido (yum!) and a beef empanada (double yum!), but those more sophisticated (or more Cuban) than we prefer to sit down in Havana's two-story restaurant — a family biz run by Cuban exile Roberto Reyes — for a full-on oxtail dinner or palomilla steak, followed by a dish of flan or tres leches, best washed down with a pitcher of homemade sangria.