I had a very good experience here. Due to evening appointments we were late for dinner and most places were closed but a very attentive taxi driver took us to the Giovanni. It was about to close too, but it stayed open for us and we were the last to leave. At that time, all that could be arranged was a steak, but it was totally delicious. We were glad to find somewhere so nice. You can get Piedmontese specialties here and I think evening booking is recommended. I will be back there on my next turin visit, definitely. It's not so far from Porta Nuova station, You can certainly walk from the metro there. Piedmontese food (and wine) is robust and well worth investigating. I would definitely explore the menu in this restaurant.
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