Went there with the hubby over the weekend and have some helpful tips:
First, - it's difficult to find. If you pull into the IHOP parking lot, it's right behind (but connected to) IHOP. You can' see it from the street.
The pizza was great, but as several other reviewers said VERY salty. I thought this would be an exaggeration after reading the reviews, but i definitely noticed that they used more salt than needed in the sauce. Although I could have done without some of the salt, it did not ruin the experience for us and I still thought the pizza was good. I would definitely order rom Itzza Pizza again.
Also, there is not indoor seating (there's a small table with 2 chairs to sit in while you're waiting to pickup, but that's it). We expected that it would be small place, but thought there would be a few tables to dine-in. Not that case though.
We got the deep dish stuffed pizza and this is definitely the place to go in Madison if you're looking for something similar to authentic chicago style pizza.