The good: Clean, modern, amazingly spacious and airy apartment in a wonderful location overlooking a small square and just 10 minutes walk from the main tourist sights. Lots of great mod-cons - even a Bose sound system to play music through your phone.
The bad: A week before check-in, we received an email from an external property management company explaining that they, not Katiuscia, handle the property. They said they 'URGENTLY' needed to know our exact check-in time (six whole days before check-in). They also sent us a 2-page list of rules, which said we'd face fines for arriving at check in more than 15 minutes after the nominated time. Considering we'd be travelling from another part of Italy on that day it made for unnecessary stress - a late train and we could be facing a hefty fee just to check in.
None of this was shown to us when we made the initial booking, and probably would have dissuaded us from booking the place.
Once we were checked in (the representative from the property management company was 10 minutes late), we were told to contact the company with any issues during our stay. We had a persistent issue with the Wifi, which only worked about half the time we were there. The property manager did not respond to our text for assistance on this issue.
In summary: A mixed bag. A lovely, clean, centrally located apartment in Florence - but one that's run by a largely absent property management company who aren't responsive to attempts to communicate.