Leonardo's place was one of the best parts of our trip to Florence. It's very close to the train station (10 mins) and his instructions were very clear (ignore Google maps -- it's wrong!).
Leonardo met us at the apartment and very kindly carried one of our bags up the stairs. It's a decent amount of stairs to the top, but of course like many other places in Italy, the climb is worth it.
The apartment is perfect for 2 people. He had also brought up a portable air conditioner unit which was great at night as it was quite hot in Florence that week. The balcony is wonderful as its large and looks over the back of the building. It's quiet and a great place to enjoy an espresso in the morning.
Leonardo also provided some snacks and drinks for us, including fruit from his father's garden, which was so delicious. There is also a coffee maker and some espresso provided which was great.
There is Internet in the apartment which is great for just checking email when you are there. There is a daytime limit of 1GB but unless you are downloading or streaming a lot, it's not a problem.
We really enjoyed our stay at Leonardo's and highly recommend it to anyone staying in Florence.