Mari's apartment was lovely. It was a 15 minute walk from the train station, and then a 8-15 minute walk to all the sights of Bologna. The apartment is on a quiet street, but right around the corner from a grocery store, plenty of cafes, etc. The apartment itself was spacious and clean. The two bigger bedrooms had air conditioning - the third smaller (twin) bedroom did not, which wasn't an issue since it was temperate when we visited in September, and the open window provided enough ventilation. (if a light sleeper were to use this room, earplugs might be helpful for the street noise with the open window).
Mari was an amazing host - she greeted us and gave us tons of useful pointers about where to eat, what to see, and even made dinner reservations for us both nights that we were there. We wished we could have stayed longer!