The appartment as such is wonderful as well as the location. As a minor point however, there was no shower gel that normally should be included nor rubbish bags.
Having said that a bigger issue with the host was the following: he didn't inform us in advance that we were supposed to send him a copy of our identify cards! He only demanded this when we were already at the appointment. I asked him to send me a link to the regulations on which his request was based because I didn't feel comfortable in sending our identify details to a person who didn't reveal his (the host refused to send me his ID in return). I have used Airbnb a lot, including in recent years in Italy, and nobody asked for such a thing.
We came to Milano to participate to the F1 Grand Prix, and I honestly didn't have time to start inquiring AIRBNB on this point, and would have expected the host to give us full information instead of just insisting it is obligatory. Naturally all the guests should be aware of such a condition beforehand.