You'll find little to fault at this little restaurant! The wine selection is great, the mussel appetizer is a must-have, and the risotto is one of the best I've ever had! The food is wonderful, and while the menu is small, the choices are well-varied: seafood, chicken, duck, beef, etc. - something for everyone. My husband and I dine here just about every time we visit Boston, which we do a couple/few times per year. They offer wine by the glass or the bottle, but no beer or liquor. Take the opportunity to try something new! This is a place where you dine, enjoy your food, no rushing in here. It reminds me of dining in Europe in that way, where dinner is a longer event, rather than dine-n-dash. I also suggest you make a reservation.
So why four stars instead of 5? Be prepared, the restaurant is *tiny* and the seating by the windows can be a bit cramped. My husband and I sat a corner table once and (FYI, we are average size people) we weren't even sitting across from each because there wasn't enough room! Considering the fact that the menu is a la carte and the bill can add up pretty quickly, especially with wine, they should provide adequate space to enjoy your meal. Try to avoid a corner table. There are booths and a counter, and they provide more room. This little place looks like it was previously a tiny diner, but is now a cozy restaurant.
There is one unisex bathroom and it is also *very* tiny. Larger people or those who are genuinely claustrophobic may not feel comfortable.