This is a quite bohemian street containing many good restaurants and bars that are well worth a visit, just follow the crowds for the best ones. I would especially recommend Toto located for pizza and jugs of vino frizzante and bar di Marche on via del Borghetto.
www.pizzeriadatoto.com
Via San Valentino, 2, 40122 Bologna, Italy
+39 051 523150
Google map: bit.ly/RAUpsx