In Bologna, I recommend you:
a) AL 15
c) DIVINIS www.divinis.it it is a wine bar and a restaurant and very interesting are their special events; maybe you can attend, if you're there in Sep 29, to their event focused on the great White Wines; anyway look at its website
d) DUE LUNE www.2lune.eu it is a pizzeria and a restaurant, and pizza is good almost as in Naples (almost in an importan word
)e) MARCO FADIGA BISTROT www.marcofadigabistrot.com very charming for an unusual dinner not focused on local typical food
f) TRATTORIA DEL ROSSO www.trattoriadelrosso.it it is my place for lunch when I am in Bologna: cheap, good, casual, short offering and a great rate price / quality.
The short list is in alphabetic order and it is not my personal rank.
You will enjoy Bologna, I am sure.