Yes Torino is an absolute favourite to return to. At times vitel etonné on a road off via Po has been our favourite aperitivo place, but it varies every visit, from exceptional to banal and sometimes booked out. Tre Galli has had its high points as well, but has more tables now, so is no longer an aperitivo destination as I remember it back ~ 2002. Favourite place for a glass, but barring large grissini, never engages in the Aperitivo food offerings, is Antica enoteca del Borgo. A good wine shop, usually with a decent selection of wines by the glass, and the option to browse the shelves glass in hand, or just sit/stand in the relaxed central 'bar' area. I think the trick is to take local advice for the current 'hot' aperitivo destination, as there is good competition, and for me the best are the ones that showcase samples of the food they'd like to entice you back for a proper meal of.
For food shops - the Italian language annual 'Golosario'. I'll also check google maps but little else now.
For restaurants, trattorie etc. I like to read around widely, but also scout google maps for areas close to where we'll be. Also Bibenda wine (only Italian language versions in the old print form) for wine-friendly restaurants/trattorie/enoteche (published by the sommelier society). Also worth checking agriturismi for those that do hearty 'banquets' that are typically wonderful value. Tripadvisor is the one source I treat with greatest caution - often the 'best' are merely the most convenient to where tourists are - though there are also a fair share of dubious recommendations and criticisms.