Circa is a fantastic date spot. It's a beautiful restaurant, but the bathrooms are located up a flight of narrow stairs, so if you have a broken leg...I would wait.
The tapas are delicious (Tuna tataki...YUMMM!), and I like to go there when I want a light, delicious meal and some wine. The food is fantastic, but if you're meeting a large man for dinner, or if you are a large man wanting dinner, I would just eat tapas here and then go for dinner someplace else. My boyfriend (6' 200lbs) took me here for my birthday and he ordered a steak and looked at me and said, "What is this? I wanted something off the adult menu!" The portion was so small, I had to take him back up the street later that night to Slice of Life because he was still hungry after eating tapas + $18 meal for himself + shared dessert + cocktails. Go to eat great food, not to become full.

I ate there last night and our waiter did not get half the people at our tables order correct or he would keep coming back to ask. I waited 10 mins after everyone had there dinner before mine came. The salad was a good portion but our dinners were really small. I ate the lobster ravioli and only had 4 raviolis that were about the size of a quater with very little sauce.