"A second professional pan de Mallorca maker, Cafeteria Mallorca, has a more neighborhood feel than Bombonera. Chances are, if you ask around, you’ll get this recommendation from locals. It is the oldest standing diner on the island, and is able to stay open till 3:00 pm purely through word-of-mouth."
An Insiders Guide to San Juan, Puerto Rico: Where to Eat, Stay and Play