The Cafe Diplomatico, or the 'Dip', is a cheap Italian coffee place / bar / restaurant on College Street. The decor is nondescript with soccer posters on most of the walls. There is a large patio which is pretty busy in the summer. The attitude of the place encourages socializing. Mains are priced from $3.25$12.95. The place is busy anytime after dusk.
The food is pretty mediocre - some of it better than others. Some of the service we've had in the past has been pretty appalling, but to make up for it the manager comped a bunch of our food and gave us all free dessert and coffee, so we came off pretty good.
If you're looking for a place to sit and chat without feeling pressured to leave then this is a great place. Socializing is definitely the name of the game.