Everything was great.
Michelangelo is very friendly and helpful, and responded pretty much immediately to any communications. He turned up in person and let us into the flat early, which was really good of him.
The flat is comfortable and cosy, with a terrace with a view of the Duomo. There are plenty of cafes, restaurants and supermarkets nearby, and it is an easy walk to the centre of Florence.
Really a great flat from which to explore the city. Strongly recommended.