I can't say enough about Nicoletta. We had a short stay in Florence, just 2 nights, and had to be at the airport for 4am. Nicoletta arranged a taxi to pick us up at 3:45am and take us, which was a huge help and really above and beyond.
The apartment is wonderful - sparkling clean and well-appointed. 2 bedrooms have air conditioning, and there are 2 fans as well (which was a nice surprise, as I usually sleep with a fan on for the noise and really miss it when I travel!) The beds are so comfortable! Note: there isn't really a living room, so if you plan to be in the apartment for longer stretches that's something to consider - you can hang out in the first bedroom (nice and big) if you want to watch TV or relax.
Some nice little touches were: tea in the kitchen, nice shampoo, conditioner and body wash, and a hair dryer! We did have a voltage converter with us so we could use our own, but it was so thoughtful to have one available since not everyone will have a converter. Plenty of towels available too.
Check-in was simple - Nicoletta made sure someone was there to help us get settled in, and her instructions were easy to follow (and accompanied by pictures, which was great). She was always easy to get hold of and responsive.
The neighbourhood seemed lovely as well. About 15 minutes or so to walk to the train station, and from there you're about 10 minutes from the Duomo and all the things you want to see. There are places close by to pick up groceries if you need any, and I walked there at night and felt perfectly safe.
I'd absolutely stay there again - the location is perfect for anyone who plans on walking around Florence and wants to be close by. Nicoletta, thank you for being such a wonderful host!