We arrived on a Saturday and soon discovered that our apartment door could not be locked. The lock was broken and two people were sent to fix it that day, but they were unsuccessful. We were told that the lock could not be fixed until Tuesday. We didn't feel safe, so we moved to a different apartment we found on Airbnb on Sunday. We had to pay for two nights and got only 50% of the rest of the money back, despite the special circumstances.
In the apartment itself the WiFi didn't work and the furnishing was very minimal. For example, there were no bowls, and no salt and pepper to cook with.
What we did appreciate was that when we arrived in Milan the first day, the host helped us figure out which metros we had to take to get to the apartment. The communication started very well, until it became clear that the problem could not be fixed.