We really enjoyed our stay in Guelfa 56 - the apartment was very comfortable, warm, stylish and sparkling clean - our best home in our Italian trip, we can recommend to anyone. We were lucky to be ones of the first guests.
The location is convenient, close to the train station, central market, 10 minutes walk to the Duomo and 15 minutes walk to the Ponte Vecchio.
The extras we paid to the daily rate - cleaning fee, Airbnb fee, taxes - were quite high, almost 2 extra days of stay, but overall it was money well paid.
We haven’t met the hosts in person, but the communication over e-mail was very efficient and easy, no problem with this.