The location is impossible to beat, right beside Ponte Vecchio and Vasari Corridor. Actually it seems that one of the walls is shared with the Vasari Corridor, which is very cool.
The apartment is as described, large, comfortable and cozy, excepting for two problem: hot water and heat, very important if days are cold and rainy, which was my case.
I didn't have interaction in person with the host, but through messages the timing the the responses were good enough.