Silvia's place is excellent. The apartment is warm, quiet, immaculately clean and extremely secure. Good shower by Italian standards but, again, very very clean. Linen and plentiful towels were provided. During the winter, washing will easily dry inside the apartment. Otherwise, you'll find a coin laundry nearby using Google Maps. Despite local bars, the apartment is extremely quiet once inside. Silvia and Felix are fabulous hosts and their communication was rapid rather than fast.
The location is excellent. Local restaurants are generally great and easy to find after browsing google maps. There's even a supermarket close by. Great bakery a few doors towards the river and another one block in the other direction. Fabulous gelato (not just the average gelato in Italy) is about 40m away. Across the street there is a pharmacy, atm, mini market and more. The back streets are the best feature of the location. Leisurely walks will lead to the studios of local artists and Cathedrals devoid of tourists yet containing a Michelangelo here or there. Of course, the apartment is within easy walking distance of the tourist centre and branded shopping. Local buses are everywhere and it's an easy walk (without luggage) to the Firenze SMN. This made day trips to Bologna etc extremely easy.
Like most properties in Florence there are a few flights of stairs from the street to the apartment entrance. It may be an issue for some, however, that's Florence.
Writing this review has just made me hungry.