I saw an earlier posting with people inquiring about Cafe Louis. I've been there many times and have enjoyed it. its more laid back than you would expect, given that it is in probably the most expensive clothing store in Boston.
As was previously noted, they've enlarged the space and changed chefs recently. They have live jazz on Friday nights in one room.
I've done most of my eating at the bar, but it is only about 6 seats, so you're only likely to get a seat there early in the week. The bartender is very knowledgable about wines. The wine list used to be primarily italian, but now has quite a few spanish wines as well as some US. The wine list is not all that long, but I've tried many wines that I was unfamiliar with and enjoyed them all.
The prices vary greatly. They have a few pastas for $19 dollars (gnocchi is great!). Entrees tend to be higher in the upper $20s to low $30s. appetizers in the mid $teens, but they are large. There is a seared beef in a tonato(?) sauce that is great. tonato is fish based -- which sounds weird. while you can taste a little bit of a fish taste, I think that I wouldn't have guessed it if I didn't know thats what it was. its very creamy -- reminding me more of a cheese sauce. the beef is very rare and melts in your mouth.
I've ordered a side order of brussel sprouts (very young and tender) several times --- they are great and the order is huge. i take half home.
they do have some nice touches, they start you off with an amuse bouche (free little chefs taste) and they give you 2 little rolls (for breakfast) with your doggy bag.
This Friday night, they are having a special set menu with paired wines from the Rhone region. (a little pricey at $125)