Karin's place is the ideal pad for anyone visiting Florence. Right next to Santa Maria Novella, in a very quiet and chic neighborhood, the place was very well equipped and tastefully designed. It gave us a very local experience, like we were part of the city and I would definitely book her place every time i have the occasion.
Karin was a great host, she even crafted a sight seeing tour for us and recommended places to eat, all of which were marvelous.
Oh,and if you're in for a longer stay, don't worry about not having a washing machine for your clothes, there's a laundry place right around the corner, with very good prices.