I'm looking for a place in Boston/Cambridge for surprise 50th dinner party for my fiance. There will only be one other couple with us, but it will be his best friend who he hasn't seen in several years and so I want them to be able to have a nice visit - so not too formal a place, don't want them to be afraid to have a good laugh - but still a special dinner (terrific food, terrific service, special atmosphere, etc.) I'm wondering if anyone knows of a place with a tiny private room, like a wine cellar-type thing? But I'll happily take other suggestions! Thanks so much.