I had a wonderful stay at Cinzia and Niccolo's flat. (If you're looking for somewhere close to EUI, it's walkable). The space is absolutely spotless and has been thoughtfully cared for. The instructions for how to use each appliance etc. are clear without being intrusive. It looks on the map as though the flat is far from central Florence, but there's a bus stop a minute's walk away, and it is incredibly simply to get into town (and then it's nice to be away from the tourists). Niccolo was great about my changing check in time due to flight delays and he kindly arranged a taxi to take me back to the airport. I'll absolutely stay there next time I'm in Florence.