My daughter and I stayed for two nights visiting Florence.
Everything was as described. Though the building may be hundreds of years old, everything inside had been modernized and looked newly renovated. The main bedroom is spacious and comfortable. The living/dining/second bedroom combination is also large. The sofabed looked brand new and was comfortable. The kitchen is small but quite functional.
The location is great, situated in an old part of town, within 10 to 15 minute walk of the train station, Duomo or Uffizi galleries. We walked everywhere within Florence, except for attending the soccer match, where the stadium is reachable by bus.
Our host Sandra was very personable and well organized. She responded to our initial request within one day. She met us at the apartment and answered all our questions. A binder containing essential information for all guests was provided as well. On check out, she arrived on time to collect the keys.
Maybe sure you are able to climb a couple of flights of stairs before booking.