Café Noir is a great (and popular) place to spend a few hours over coffee, tea, or alcohol. They do have beer on tap. In Santa Croce, near Dorsoduro, Café Noir gets very crowded late; after about 11 pm, the clientele spills outside into the narrow street. If you get there early enough to get a table, however, you’ll find yourself surrounded by low-key locals relaxing for a drink, ranging in age from 20 to 40 or so. There is Internet access in the back, so you can have a drink while you check your messages. It is smoky, though, so if that bothers you, consider yourself warned. (However, if smoke bothers you that much, you probably won't last long in Italy.)