Lulu was one of the first restaurants I went to after moving to Plaza Midwood, and it remains one of my favorites.
The food and atmosphere are so great that one negative experience didn't really dent my impression of the restaurant: During one dinner, the waitress accidentally knocked over my glass of wine, soaking my jeans with Riesling. I had already drank a lot of it, and she apologized profusely and brought me a new glass that was very full. I left with wine-soaked jeans, but I was pretty drunk and content.
Lulu is a great place for a nice birthday dinner or date. I often see groups there catching dinner before a play or show. It's upscale, but you can also get away with wearing jeans there. The frites are delicious and the perfect appetizer. I highly recommend the Chicken Cecelia, brie-stuffed chicken that comes with potatoes and greens. You should also go on a nice day and have brunch outside.