I attended a group dinner at Trattoria Cinque recently, and the best thing I can say about it was that our hostess picked up the tab - she's a very generous person - saving me from hours of self-loathing about having paid $23 for a smallish square of lukewarm, just-barely-above-Stouffers-quality eggplant parmesan. The bread & ricotta was pretty good, as was the mozzarella in the caprese salad (although the tomatoes were hard and tasteless). Glancing around the table, I noticed that the lettuce in the Caesar salad was brown-edged, and the chicken was dried-out and burned in places. At meal's end, the custard filling in the profiteroles inspired some fond reminiscences of Snack Pack pudding.
The service was mostly fine. We had several servers keeping the water, bread and drinks replenished, and everyone's food hit the table more or less simultaneously (no easy feat as there were a lot of us). The only real fault was that we weren't told about any specials. Maybe there weren't any.
If you go (and don't), note that the menu on the website is out of date. The prices have gone up, and some of the items have changed.
I have been there at least a dozen times. The lasagna Bolognese is good. The short rib ravioli is real good, Other pasta dishes are also good. The pizza with pears , gorgonzola and truffle oil is really good. There are different pizzas I think daily. The Caesar salad is excellent, they prepare it in front of you. The space is really nice and they have a private party room in the back. I had a kobe beef burger there for lunch, was nothing to write home about.