I think it is a nice place for its price. You will be in a good location in Florence, close to touristic places, restaurants and supermarkets. Place is accurate to the photos, overall clean.
But if you suffer of any body pain or similar, you must consider before booking that the bed is uncomfortable (hard mattress and pillows), and the flat is in the second floor of a main flat, so in any case you need to use stairs.
The rest is nice, Sandra is kind and has a good disposition.