I do not recommend staying here.
Many things are broken/unable to be used, the apartment was unclean, we did not receive amenities, and it is not child-friendly.
There was a used condom on the floor upon arrival and, after asking for it to be cleaned it up, it was still on the floor. He said he cleaned up part of it but the whole thing was there in the same place, just with a cushion on top of it.
The advertisement is dishonest in its listing as 'kid friendly'. The apartment had glass on the floor upon arrival. After requesting a cleaning of the floor, one of my guests stepped on glass and had a piece in their foot. We emailed asking before if it was safe for children and upon arrival we realized there are many things that are unsafe for kids: ledges without railing, cords, and glass.
Most knobs are broken or falling off-the toilet seat, door to the bathroom, sink, and shower knobs are all broken.

We did not have soap in the bathroom or kitchen, even though amenities is listed as an accommodation. Only one of the shower heads worked properly.
We did not feel comfortable with the sleeping situation. Pillows were very uncomfortable, and pillow cases did not fit the pillows, which is unsanitary. There is no cover for the duvet on the bed, which is also unsanitary and gross!
One bed is broken with a pole sticking out of the center of it, making it unfit for sleeping and one bed is VERY uncomfortable (I backpack a lot and have quite low standards for sleeping, but this was a challenge.) The bed upstairs is fairly comfortable, though I was unsure if it had been cleaned.
Asked for a refund and was denied because I didn't ask soon enough. We couldn't find a place to stay for the second night & didn't want to cancel our stay in case we couldn't find something else for the night.
Just something to be aware of: there were a lot of stairs to climb to get to the room, so lugging a baby carriage and bags was challenging.
Pros: Christian was very nice upon arrival, the shower is interesting and the location is in the center of Florence. The place felt safe and it had A/C.