My wife, adult daughter and I enjoyed four lovely days in Florence based out of Uma and Tina's apartment. The location is easily walkable from the train station in 12-15 minutes. Staying across the river gets you away from the big crowds in the heart of Florence but you can walk to most of the major sites within 20 minutes. The apartment is in a historic building and is very cute. It felt like three adults filled it to capacity. There are steep stairs down to the kitchen and the single bed and then steep stairs back up to the bathroom. We enjoyed the novelty are the layout but it may not be good for someone that struggles with stairs. There are also low ceilings.
Uma was a great and gracious host. The house was very clean and she had seen to every detail. She made out entire stay very easy. We would stay in her place again.