We stayed here in October 2015. We really enjoyed our time in Florence and Silvia was a great host. Very informative & helpful and really good about staying in communication.
The apartment is in a great location. It was also clean and welcoming. I would recommend this apartment for travelers but there are two things to know:
1. As mentioned in other posts, the stair climb isn't unsubstantial but it's manageable. If you're sensitive to climbing 100+ steps everytime you want to come or go, you may want to look elsewhere.
2. We warned upon arrival that the water pressure, particularly in the morning, wasn't great. The building is several hundred years old and the hotels downstairs put strain on the water during peak times. However, we found between the hours of about 8-11 AM, the water pressure wasn't just bad - there was no water whatsoever. We worked around this as best we could by showering at night, but it was still a major drawback. However, we were told by Silvia that there were plans to fix this in the coming month (Oct 2015), so if you are thinking about renting this place, I would inquire to see if the water been addressed or otherwise be prepared to be without water in the mornings.
It is a great place though. I would still recommend it.