RistoRubiani. Located immediately off Piazza Bra and 10 seconds walk to The Arena. They serve both lunch and dinner and stay open past midnight which is great when attending the opera or other events. The service and food quality is excellent. The location allows for people watching and yet is quiet and awnings help with the sun which can be brutally hot in mid-summer. It is a bit pricey but given the location and quality I felt it was justified. They also do an incredible breakfast which is associated with the Hotel Bologna which was my hotel for the week.
Tre Marchetti. Located two streets over from Ristorubiani and also 10 seconds to The Arena. Has excellent outdoor seating with parasols for sun/rain. Service is excellent as is the food. The wine list is deep in local wines especially Valpolicella and Amarone. Matteo the host is also an opera singer and was performing arias during dinner accompanied by another singer who happened to be eating there that evening. This was a perfect dining experience. Should have reservations if during opera season.
Il Desco. Located in the old section of the old city center near the Piazza Signori. Matteo, the chef and owner (his father started it) is super friendly and speaks excellent english. The restaurant is styled in a dark, quiet and formal style all tastefully done. As a michelin 2 star this is excellent value for the experience. The wine list is broad and deep in Italian wines and much less so for other countries. Would recommend reservations in general but not as busy the night I went there.
Ponte Pietra. Located immediately adjacent to famous bridge of the same name in the old city. I had a lunch there. Quite busy and reservations would be helpful. A great view of the river and the bridges but a limited number of seats on the terrace. I still had modified views inside the restaurant. The food here was fabulous. I had a couple of glasses of soave and lugana which went well with the food.
In general there were an endless number of great gelaterias and also artisan food shops selling "tipici" foods. Also the local cured meats are well worth trying.
I can also recommend my Hotel Bologna for it's location and rooms.