This may seem a really tacky or simplistic topic, but last summer I went up to Saratoga Springs with a friend, and we spent some time at "The Wine Bar" on Broadway.
The place had such a great vibe that I wished there was one in the Boston Area. I guess when you go to a nice restaurant in the South End, you can get a similar experience, unless it's a Friday or Saturday night. However, there was just a quiet simplicity to the experience, tasting wine and nibbling on apps. Sometimes you want to step away from the hubbub, as it were, into a quiet oasis of gastronomic delight. Any ideas?