While I am the farthest thing from a fan of her sister-restaurant (Ip Modern Kitchen) Walnut Grill is great.
This fun little place has a great menu, with some really great deals. Monday and Tuesdays feature cheap burgers, there are drink specials daily, and the staff is always friendly. We have begun to frequent Walnut Grill, and have yet to be disappointed.
Oh! Make sure you ask for bread if they don't bring it out to begin with. It is made right there, comes out warm, and always has some interesting things to spread on.
The buffalo chicken wrap is good too.
My only complaint here is that the Guinness is served in a tulip shaped glass, but is a significantly lower volume than a real Guinness glass (12 ounces here, vs 16 with an American Pint Glass, or 20 with a European glass).
We love this place, and recommend that people try it out!