We stayed 3 nights in Duccios centrally located apartment.
Whilst we experienced a few issues communicating with Duccio as he was travelling, we were able to pick up the keys from the helpful staff at OK bar ( right down stairs) and drop them back at the end of our stay.
As stated there are quite a few stairs to reach the apartment which are very steep and only have a shakey rail. We are young and relatively fit but was a struggle with our heavy luggage but managable.
We would suggest packing light if possible.
The location of this apartment is excellent! Between the Duomo and Accademia and within easy walking distance to Ponte Vecchio and Firenze SMN train station. There are plenty of good restaurants nearby. We even enjoyed chinese which is just on the next block for a much needed hit of veggies after a month of eating to many delicious carbs.
There is a convenience store, gelateria and a coffee shop a few meters from the apartment. You really have everything you need within short walking distance.
The apartment itself is clean and nice. The beds were comfortable. We had a few loud locals outside on one night during our stay, they were enjoying themselves into the early hours, however was not to much of a problem.
The washing machine was out of order when we stayed but there is a reasonably priced laundromat in the next block which washes your clothes in 30 mins and you can enjoy a drink at OK bar whilst you wait.
I would recommend this apartment for anyone looking for somewhere central to explore Florence.