I exchanged some messages with Alessio. He was generally responsive within an hour or so. The check-in was good. I called Alessio when I arrived and he remotely opened the building door. From there is was self-check-in by retrieving a set of keys from a lockbox. Check-out was the reverse, except there was no need to call. I didn't get an opportunity to meet Alessio or Kika in person, and interactions were minimal (to me that was okay, others may like more help with local information, etc.).
This apartment is great in some respects and not so great in others. First the good parts: the apartment is in quiet building, somewhat removed from other foot traffic. The bed is very comfortable. Everything was very clean. The wifi as measured by SpeedTest was variable but 19-26Mbps down and 20Mbps up; pretty good. The basics are there.
Second the not so good parts: the shower is pretty small (25.5 inches square from wall to wall) with a floor that is slippery when wet. There are no towel bars in the bathroom or kitchen (I used the radiators--which worked well because it was cool and the heat was on).
The location is okay. There are some decent places to eat and drink in the neighborhood, a Tigotá and a PAM are less than a block. A lot of the better restaurants and sights are in the upper city. If you don't want to walk up to the upper city, Cittá Alta (the uphill hike takes some energy, over 300 feet of elevation), you can walk to the funicular in the lower city (20-30 min) and hope there's not much of a line. Better, take any bus toward Porta Nuova from the nearby stop on Via Camozzi near PAM and then change in Porta Nuova to the 1C-Citta Alta bus, diagonally across on Vialle Papa Giovanni XXIII, to the end of the line at the top (not as scenic, but way faster and saves the walking for getting around the upper city).