Alexander's place is definitely a really good option if you are staying in Milan, either for just a couple of days or even longer. The place, although not that big, is really well organized, with so many thoughtful touches and small amenities that you don't always find in an airbnb apartment or even hotel. I think they have done a great job at making the most out of the duplex. The only slightly negative part (although I can definitely see why that is, and it's not really the host's fault) is that because of the water heating system used, when I took a shower (although I was really fast) after apx. 5 min the water started to get really cold. It's definitely not a big deal, just something to keep in mind.
The communication and the check-in couldn't have gone smoother, the host was always responsive, and Carlos was right there to greet me and show me the place on the first day.
I would definitely recommend this apartment. Thank you Alexander for a really nice stay!