My dad is a native of Chi-town so he knows his pizzas. I've lived in Illinois for a few years as well so I'm acquainted with the Windy City's style (which kind of made me a bit picky about pizzas).
The place has a pretty spacious eating area decorated with Chicago sports memorabilia. They also offer free hot dogs if you have their name of the day. Too bad my middle name didn't count for today's name of the day.
Their dogs are great and there's lots of combinations available if you're in the mood for a slice of pizza or Italian beef. They even offer Green River at this place too.
We took a deep dish pizza with us home and I was stuffed after one slice. Since my mom doesn't eat meat my dad and I are gonna have a hard time finishing this thing by ourselves!
Only advice I might add is that they only have 1 or 2 ladies (who are nice) taking orders so be patient the food is worth it. :)