Just spent a fantastic week staying here in Bologna. Gianmaria was super quick with communications - I had it all booked within 10 minutes of submitting the request! Very quick at replying to question. He sent us a email a few days before we were due to arrive with all the info we needed to get to the apartment and contact details, plus extra tourist info about Bologna. He also messaged us whilst we were at the apartment to make sure everything was OK.
The apartment is around a 15-20 min taxi from the airport which cost €15 - which split between the two of us was very reasonable. There are also buses from the airport to near the apartment.
We didn't meet Gianmaria himself, but his friend was waiting for us at the apartment and let us straight in, showed us about, and gave us the keys.
The apartment is warm, light, and airy, and very well equipped. Because we were in Bologna for the whole week, we spent quite a bit of time there when the weather wasn't so good, and it didn't feel cramped at all. The water for the shower was reliably nice and hot. There is even a small balcony which catches the sun - I imagine that would be lovely as the weather improves.
In terms of location - we were able to walk absolutely everywhere. We visited every tourist attraction and restaurant we had intended to go to on foot. The only time we needed to get taxis was to and from the airport. The area seemed nice and safe, we had no problems sleeping at night, and no issues regarding safety.
If you want a great base for exploring and a comfortable living space - I would definitely recommend this as a place to stay!