Irene's place was perfect for our stay in Florence. Irene met us when we arrived and gave a brief overview of how to operate everything in the apartment. She even gave me a list of restaurant suggestions when I asked for it.
The place was spotlessly clean. We only stayed for three nights, but with the full kitchen and washer/dryer we easily could have stayed comfortably for much longer.
The location is very central - no more than a 20 minute walk to nearly everything. The one downside to this was that it was noisy at night. Bring a white noise machine and you won't have any problems!