Focaccia Fiorentina is a great place to eat downtown. It's usually really quick to get through the line, quick cafeteria style serving, and lots of indoor air conditioned seating. Really yummy pasta - which sucks for someone who is gluten free, but really great when you want to cheat! I like the Penne al Vodka, but there's a ton of choices. There's always a special - usually chicken - and they're pretty friendly here as well. You can always get to-go as well.
Just be careful, they serve rolls with every meal. It's a carb fest, but it's yummy and quick working downtown!