First the photos of the flat are accurate, the flat has been recently renovated and the mix of modern and antic looking furniture is of the best effect. The flat is spacious, I had room to do a bit of Yoga without pushing any furniture. It has a small garden behind, with table and chairs, which I would definitively have used for breakfast if the weather would have been warmer.
Manuela has been very responsive and forthcoming: I was missing a couple of Kitchen utensils, after asking I had them the next day.
Language wise, Manuela speaks only Italian, but Manuela's granddaughter who lives upstairs speaks very good German and some English.
Regarding the location, it is just perfect: it is not in the crowded center and yet in 15-20 minutes walk you are at the ponte Vecchio. Also the porta Romana (~10 min walk) has a variety of food/grocery shops.
I only have one criticism: if you are a light sleeper do not forget to take along a set of ear plugs.