Finding a restaurant in Castello Basso can be difficult; this neighborhood trattoria is the only fairly priced place near San Pietro di Castello. The red, hand-painted sign above the window reflects the homey interior and also the cheerfulness of service: tosi refers to the "young lads" on the waitstaff, as opposed to the grumpy, aging career waiters you might encounter elsewhere. Step inside to sample a dish of pasta with seafood, or tossed with fresh veggies, and to taste some well-prepared cicheti. In the evening and on Thursday at lunch you can also opt for pizza; on Monday, Tuesday, and Thursday evenings there's only pizza.