I love Postino! I have visited more than half a dozen times. The waistaff are always friendly yet professional, and the atmosphere can't be beat for a group of friends. It is not an ideal first date spot because it is "open" seating and usually very full. However, I meet girlfriends here for wine and bruschetta all the time.
Make sure to have the soup of the day, a great glass of wine (or a bottle!), and DO NOT MISS the bruschetta.
Enjoy!