I had a great stay at Agnese's place in Florence. Her father Sergio met us at the apartment, helped us with our MANY bags, and gave us a great overview of the place and city.
They apartment is exavtly as described online - very spacious, clean, and comfortable. It is also in a great location; just outside of the main tourist hubbub, but within walking (5-20 mins) distance of most of the major (and minor) sites in Florence (Duomo, Uffizi Gallery, Academia, Ponte Vecchio, and Train Station). In addition to being close to all the "action", it also seemed to be safe; I felt very comfortable walking to and from the apartment in the evenings/night.
I thoroughly enjoyed my stay and would love to stay here again if/when I return to Florence.