We haven't met Giulia and Nara personally, as the Airbnb was a self check-in place and they assisted us from a distance. Their instructions on how to get in were very clear though. Moreover, Giulia was very available for questions by phone or by Airbnb message and she replied quickly.
I think the Airbnb could have been slightly cleaner, as there was still tobacco and such on the table in the living room/kitchen when we came in.
Moreover, the Airbnb's commodities were slightly basic; no iron, washing machine, or a bottle of water in the fridge, etc. were available. In principle this doesn't really matter, because we only slept in the Airbnb and went out after waking up. However, this would have given the Airbnb a slightly more luxurious feeling.
The location is perfectly central in Bologna and everything in the city is at walking distance. This, for us, was most important, so all in all, we had a lovely stay.