I got very detailed and perfectly written instructions for finding and entering the apartment.
The host waited for us and kindly showed the apartment.
The position of apartment is perfect, it is easy to reach the entire center of Florence and you can enjoy ponte Vecchio in the morning before the crowds. My mother is walking on cruches so it was very important that everything is nearby. There are a few nice restaurants around and a small market in the same street (i found them hard to find so this was very handy).
Apartment is nicely furnished, with view of ponte Vecchio from living room window. It has a nice, normal kitchen and whole living area is big enough and comfortable. Beds are large and comfortable. We were here in winter, apartment was nicely heated with floor heating in the bathroom.
If I come back to Florence, this apartment will be my choice again.