I use this restaurant almost exclusively as a “take away”, if eating in be prepared for an intimate meal of rubbing shoulders with table neighbours and collecting your food yourself. Be aware that your order will be called out from the counter.
Da Cimino has the most deserved, unofficial title of The Best in Town so be prepared for crowds, if the crowds spilling from the door put you off walk the extra 20 yards to Mario & Lino, to my mind equally good :)

And a little teaser for the international guests:

Da Cimino is a small, crowded and real real real italian pizza 'restaurant' in the very center of Bockenheim, the bohemian quarter of Frankfurt.

I don't know, if the staff speaks english, but you can order by numbers - the wide menu is placed at the wall above the order counter. Your pizza or pasta will be made in front of your eyes and after the numbers of your dishes are shout out by a Robby Williams Look-A-Like waiter.

You can have your meal in the very unintimate restaurant or kind of outside, in a very unintimate 'garden'

You won't be served at place - but the quality of the pizza you'll get there beats everything and is it worth to bear a litte discomfort!