From Frommers.com:

"Dana Street's intimate, brick-walled bistro on cobblestone Wharf Street (in the Old Port) specializes in seafood that's fresh as can be (the docks are close by) and cooked just right. Diners sit at copper-topped tables, designed so that the waiters can deliver steaming skillets directly from the stove. Looking for lobster? Try it grilled and served over linguini in a butter-garlic sauce. If you're partial to calamari, they know how to cook it here so that it's perfectly tender, a knack that's been lost elsewhere. Otherwise, go for seared tuna, fresh mussels, or a grilled piece of whatever's come in (swordfish, perhaps). This place often fills up early, so reservations are strongly recommended. But, like Fore Street, one-third of the tables are reserved for walk-ins; it can't hurt to check if you're in the neighborhood. In summer, outdoor seating is available at a few tables on the alley."