I can't add very much to all that has been said already about this apartment and Donata. The apartment is an easy 20 minute walk to the centre with lots of bars and restaurants close by as well as a supermarket and access to public transport and the station (again about 20 minutes walk).
Donata kindly left us some milk, juice, tea and coffee which was very welcome as we arrived quite late.
The apartment is warm, WiFi works well and it was spotlessly clean.
Bologna is a fascinating city to explore and this apartment was the perfect base and I highly recommend staying here.