Our experience was excellent overall. 9.5/10. First of all, Azadeh was flexible with us. We were arriving by car from Tuscany around 11a and even though check in was at 1p, she met us at the building and took our bags so we could enjoy the city until the room was ready two hours later.
At check in, she spent 15-30 minutes reviewing all the details of the apartment and how to use the appliances. She also answered all our questions regarding restaurants, museums, and other activities. She even booked us dinner reservations! In fact, the second night, she answered my Airbnb chat message and booked us another dinner so we didn't have to use my international calling plan.
The room is in a great location because you can see the duomo from all over the city as a landmark and know how to get home. The condition of the apartment was great, clean, and surprisingly quiet.
There was only one opportunity for improvement and that is with the hot water. It's a tankless system,l within the apartment, so when you're showering you learn the rhythm of the temperature: hot, less hot, tepid, hot again over about 20 seconds.
Once again they truly are super hosts and we would highly recommend staying with Alessandro and Azadeh!