Alessandro and Azadeh were excellent hosts and have a lovely studio flat steps away from the Duomo. I met with Azadeh around 11am to drop off my luggage and she was generous do give me the keys and tour around the flat earlier than expected. She provided helpful sightseeing and restaurant tips to do around Florence. Alessandro and Azadeh reply very quickly to their messages.
Their flat is a 10-15 walk from the train station and all the major Florentine sights are within a 30min walking distance. Their studio flat is comfortable for 1-2 people.
I hope to return to Florence in the near future and would certainly stay at their flat again.