I really loved the apartment - it is adorable and just as described, in a great location and very quiet, and I would love to stay there again. The only reason we're not giving it 5 stars is because we had an issue with the AC and the communications around this were a bit frustrating.
The Sunday I arrived, the AC wouldn't turn on. It was late by the time I tried to turn it on, so I waited and messaged Mariella the next morning about it. She showed up to take a look at the end of the day Monday, of course wasn't able to turn it on either, and said she would try to find a technician to come see it the next day. My friend arrived to stay with me that day, and she has health issues that made having AC really important (plus Bologna can objectively get quite hot and muggy in the summer as it was that day). Knowing that a technician wouldn't come for another day (and we had to work the next day in the apt), my friend asked Mariella if she could bring us a fan the next morning, to which she basically responded no because she didn't feel like driving one there to us. At that point my friend said she would have to go to a hotel the next day if we couldn't get at least a fan, and when I conveyed this to Mariella she responded "this seems a bit excessive because it's not too hot" (though it was for my friend, who could not sleep at all that night). She did however bring one fan for my friend the next morning after we implied we would need a refund if we remained without AC or a fan, and a technician the day after who was able to fix it, so we ended up having AC for 3 out of 6 nights there. Again, the place is lovely, and it's not like it's Mariella's fault the AC broke, but my friend did not have a great time the first few days and did not appreciate Mariella's condescending attitude toward her asking for AC (or at least a fan).