Love this place.

1 South Park. A master stroke. www.americansf.com
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Gambinos makes a mean sandwich.

Tough to beat this lunch spot for a great quick sandwich. Don't know if there's a better little lunch joint in the financial district for a real solid sandwich. East coast and west coast styles available, solid rolls, quality meats and produce. Located at 1 Embarcadero off of the front street side. Highly recommended.
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Velo Rouge Cafe out by USF a good find.

If you find yourself looking for grub out in the Richmond neighborhood of the City you can't go wrong by stopping in at Velo Rouge Cafe. Excellent coffee using Blue Bottle which only allows you to use their fine beans if you go through their training process. Each cup is individually brewed, this may take a minute more but it's worth it. The food is fresh, with some good breakfast and lunch offerings from their smallish but interesting menu. They do have some special dinners during the week and have a pizza night as well.

Nice ambiance with good music usually going and free wi-fi making it a bit of a hangout. Vibrant and active cafe. Live a music on occasion. From a courier perspective, good parking but not always the fastest of service (yet friendly) and line can be long at times.
www.velorougecafe.com

Teds Market in SF

Lines that wrap around the aisles are common here to grab one of the great sandwiches available here at Teds. All for good reason as they churn them out fast here in this amazing little deli. Looks like a typical corner store but it's so much more. 1530 Howard at 11th, pretty easy metered parking at this take out only place. http://tedsmarket.com/