Located in the North End, Neptune Oyster features a dark blue facade with a large window revealing oysters displayed on a bed of crushed ice overseen by a blue aproned shucker in perpetual motion. The cozy setting is just short of boisterous, but it's charming. The narrow interior has mosaic tiled flooring, a slender white marble winding along the side of the room, and a red leather banquette on the opposite wall. The day's oysters are presented on a small card, and on the wood-framed, wall-mounted mirror. Keep it simple, as in some briny bivalves, a New England-style fritto misto sandwich on locally baked brioche and a nice bottle of wine picked from the thoughtfully curated list highlighting labels from European coastal regions.