We were referred to this apartment, and it was an amazing find. The view was absolutely breathtaking, looking directly at the Duomo. It was nicely appointed and spacious. The entire apartment has been completely redone, meticulously clean, with wonderful bathrooms and kitchen. The host is very gracious and helpful.
You couldn't ask for a better location, right on the square. We had been watching this webcam before the trip and it turned out that it was mounted on this very building – practically the same view as from the apartment. https://www.skylinewebcams.com/en/webcam/italia/toscana/firenze/piazza-duomo-firenze.html
It was phenomenal to be able to lie in bed, gazing at the Duomo, seeing the cupola, looking at the gold orb and cross at the top. An indescribable experience.