I'm not a huge pizza fan (I know, how un-American of me.), but I really enjoy Pop-Up Pizza. I love that you can get a great slice of pizza (with light sauce for me) in about 2 minutes... it's so quick! They also have the normal pizza place type foods - chicken tenders, wings, fries, garlic knots... etc. They are also priced well for being downtown.
Tip - They are located in the Plaza Hotel at the end of Fremont!