The place was amazing. Comfortable, clean and spacious. Two good size bedrooms upstairs, each with their own bathroom and shower. Nice living space downstairs with living room with sofa bed, dining table and small kitchen with necessary amenities. Three smart tv's, two of them with netflix and youtube (helped when kids were tired and resting after a long day in town). Wifi worked great. Small tray of goodies with crackers, nutella, honey, jams, and tea to have as a quick snack. Amazing location right next to the duomo, and close to the train station. Would highly recommend this place for a visit to Florence, especially families with kids. Costanza was a responsive host and would answer any questions or requests promptly via WhatsApp.
Only negative was that the shower in one of the bedrooms did not drain water that well, but I am certain that this will be rectified after I mentioned to the host (Costanza).