The apartment was as amazing as described. It is in a luxury apartment building beside the river, safe and quiet, as well as in very good condition of management. With two bedrooms and two bathrooms, it was very spacious and bright for us three girls - it actually can easily accommodate 2 families of three! Just one reminder: the hot water is limited for 2, up to 3 persons to use at same evening. The 3rd/ 4th person has to take shower in the next morning when the ballon is reheated.
The apartment was spotless clean and comfortable, even with a terrace on there you can have a nice view to the river and city.
IIaria is such a nice host, she provided us a map and marked every possible spot that could be useful for our visit. And also, a list of restaurants and bars local and good! I would definitely keep that for record for my further trips to Firenze! She also gave us great help with taxi booking, restaurant booking and other questions related. Excellent communication via wechat and thanks to IIaria for all your help and arrangement :-)