Nicky,
If you are looking for casual Italian comfort food Tufano's is good. Cash only. The DiBuono grandfather was Capone's chef. I also like RoSal's, La Scarola, Bruna's and Bella Notte. There is also Piccolo Sogno which is fancier than the rest above.
Yeah, I forgot about the cash only thing at Tufano's... thanks, FRF. I guess we are so used to it that it's second nature.
Bella Notte is very good as well. Love that warm fresh focaccia bread they bring out first thing - good stuff! Nicky, you can't go wrong with any of these places.
Enjoy your time in the city! For a nice neighborhood pizzeria, check out D'Agostino's... we like the one in Wrigleyville best.
http://addison.dagsdelivers.com/zgrid/themes/753/intro/index.jsp