I was staying at Cinizia's apartment for 1 month and a half.
The check in was on time.
The house is in a prefect position in the center of the city, 2 min walking from the Duomo of Florence and 1 min from a supermarket.
Cinzia respond very quickly to every problem.
The only thing negative is the Wifi, it's not from vodafone but a portable modem from Tim, it works but is very slow.
Except that it was an amazing stay I recommend it for long and short periods