Paolo communicated several weeks ahead of time to make sure we knew how to check-in. He also asked for copies of passports ahead of time.
I had trouble opening the door and he answered my call.
The shortened version is this: the place looks clean. The sheets are changed, but the entire place was not clean and needs a good dusting, including the appliances.
The apartment is just down the street from a Pam Local, in-between two metro stations (about 5 min walk each), and across the street from a museum. It is a 15-ish minute walk to the Last Supper painting, and a 20-ish minute walk to the Duomo. There is a pizza place within 1 min walking distance. The location is awesome.
The sheets were clean and it looked like most of the surfaces had been wiped down. Our first night there we noticed a rotten fish garbage smell coming from somewhere near the sink.
The smell made eating dinner at the table difficult.

Then we opened the dish washer to wash the dishes. The smell was much worse. The next day I messaged the host, but got a sanitizer from the grocery store and let it sit in the dishwasher while we went out. It took two soaks of sanitizer in the dishwasher to be able to clean it to alleviate the smell.
The food trap in the dishwasher was full of old food. Some food didn't look like food anymore. We ended up buying liquid dish detergent from the Pam Local and washed dishes in the sink.
We didn't receive any response from the host to see if the problem had been fixed, or offering to get the problem fixed. Before, we usually received responses very quickly.
There was also a strong mildew smell and visible black mold in the clothes washer. We did not wash clothes because of the mold, and being able to wash clothes was one of the reasons we booked the Airbnb.
It looked like the bathtub had been wiped down, but there was black residue in the grout that came off when touched.
There was a good bit of dust on the top of everything above an arms reach.