Pros - (1) The location is simply unparalleled. Steps from the Duomo, with a beautiful view of the Duomo whilst still having the tranquility and quiet so rarely found in a busy city. The terrace was so, so lovely. (2) Modern and airy design - the apartment was very contemporary in style, with lots of whites and neutral tones. It was also spacious, easily accommodating two people with ample closet space for a longer stay. The kitchen was quite big as well, with a large fridge and a fully stocked kitchen if you'd like to cook. (3) The WiFi - strong connection throughout the flat, including on the terrace itself. Also had a Smart TV where you can use Netflix. (4) Clear communication. The hostess is very responsive and even has a printout in the flat with restaurant recommendations and a laundry service nearby.
Cons (Kind of) - (1) Accessibility. It's on the third floor with no elevator, so keep this in mind if you have big suitcases, young children or traveling with someone who cannot easily manage stairs. The host was so kind as it help me haul up my big suitcase, which I greatly appreciated. (2) Mosquitos. The terrace does not have a screen door and it's hard to close it once you're on it (there's always a little crack into the flat) so a couple mosquitos snuck in! Nothing crazy or unmanageable but it is a good idea to have some bug spray if you intend on hanging out to enjoy the stellar Duomo views at night.
Overall, really enjoyed my stay and would love to go back!