Time Out says
Order a slice of pizza, focaccia or a panino, plus a beer for the road at this take-away only joint in the San Polo sestiere, near the Rialto Bridge.
The menu is short at Antico Forno, the ambiance is of shoebox proportions and service may be brusque—that is if you can elbow your way to the counter, past all the Instagrammers snapping photos of the archetypally awesome pizza served whole or by the slice here, but always to-go. “Pizzaccia” is a thick chunk of lofty focaccia bread overflowing with pizza toppings, or you can get a regular thin pie or an overstuffed panino (sandwich). This is good, honest grub at fair prices.
Time Out tip: Venice suffers from a dearth of public places to sit down, and Antico Forno has a tiny, SRO dining area. So make your purchase, then walk about 4 minutes WSW to Campo San Polo, where you might be lucky enough to snag a park bench on which to enjoy your meal.
Cantina Do Moro: For wine and cicchetti in a legendary Venetian hole-in-the-wall
Rialto Bridge: For swoon-worthy views of the most famous of the Grand Canal bridges
Scuola Grande di San Rocco: For Tintoretto paintings in a dazzlingly ornate setting