I love Turin. A great city not inundated by tourists. Depending on your interests, I would recommend the Egyptian Museum, the National Automobile Museum, the Royal Palace and Armory and the National Cinema Museum located in the Mole Antonelliana.
My favorite restaurant in Torino is Pastificio Defilippis dal 1872, Via Giuseppe Luigi Lagrange, 39. Not Michelin type restaurant but great pasta dishes and reasonably priced. They seem to have staying power since they’ve been in business for over 150 years.
If FlixBus is convenient schedule-wise, don’t hesitate to use them. I’ve used them a few times and was happy with their service. No complaints. Purchase tickets ahead of time online to get best prices. They have a good website and app.