We had a great trip to Bologna and Antonio's apartment made a good base to explore the city. Antonio was a great host, really responsive and provided lots of information - we really appreciated being flexible on check in times. The apartment was quite small but had everything we needed as a base for the city, including good shower and comfortable bed.
It was about half an hour to walk to the main square in the city centre, but bus routes were very good (particularly from the airport and to reach the central station) and regular, so it didn't matter too much that there wasn't too much around in the direct vicinity. Only small complaint was that walls seemed quite thin so there was a fair bit of noise from nearby apartments at times.