Mario is a very organized man, running his guesthouse professionally. No time wasted, we were set in 10mn. Mario recommended us a nice gelateria (La Sorbetteria Castiglione), a bit south, but it was worth the walk ;)
We were lucky to have the room next to bathrooms (2 available). The room and bathrooms are very clean and nicely furnished. Unfortunately we didn't get the chance to taste the breakfast as we had to leave the house early to catch our plane.

Our room had view on via Marconi which is a fairly busy one, so it was a bit noisy. We were so tired after wandering all day in Bologna that we slept like babies anyway.
There's a convenient grocery store just next to Mario's apartment, and the center is like 10/15mn away on foot. There's a nice restaurant not too far called Tonino on via Cairoli.