I'm going to be throwing a dinner party for a friend's birthday in early September. I'm looking for something that's outside of downtown Boston, preferably in Central Square, or another part of the Cambridge area that's easy to get to via both car and public transportation. He's someone who would appreciate a place that has great food but is very, very, very low key. He doesn't like anything that's fancy. (He refuses to ever go to the Cuchi Cuchi.) He loves Italian and Portuguese food, good beer, and good Manhattans. Any advice?