(Not reviewed but highly regarded and always busy)
Fredy Tucan's 245 Basilio Badillo (Old Town) Great Breakfast until 2:30 p.m.
I'm not a breakfast eater (well maybe a Bloody Mary), but Fredy's Tucan is a very popular place if you're looking for gringo-friendly omelettes, eggs, pancakes, or waffles - served until it closes at 2:30 p.m. It's open air, breezy, with a lovely interior courtyard. Check out their web site.