The only place we've stayed in Bologna was at the University Hotel. Is it pretty basic, no frills, functional hotel room but is well located near restaurant areas and in the University students side of town so cafes are cheap, funky and plentiful. It is about a 10 minute interesting walk from the core of old town.
https://www.hoteluniversitybologna.com/
Unless you're big eaters in the morning I wouldn't recommend paying a hotel for breakfast since plenty of coffee and pastry deals abound in the college area. A coffee, cappuccino, pastry and doughnut at the first place we visited was 5.50e. In my jet-lagged haze I actually triple checked to make sure I had paid for everything. I can't see paying 7+ euros a person as opposed to experimenting and trying a new funky place for breakfast everyday.
Enjoy Bologna,
=Tod