Unfortunately, we did not get to meet Duccio but the turnover of the apartment keys was easy via OK bar and Duccio was available to reply to any queries. The apartment is very spacious and charming. We were a family of 4 and my kids enjoyed sleeping in the loft. As Duccio reminded us, the apartment is at the very top of the building and so this may pose a problem for those who are not so fit and/or do not travel light. Otherwise the stairs are not a problem.
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 including the best Bistecca alla Fiorentina we had during our stay. There is a convenience store and very good gelateria a few meters from the apartment. The washing machine was out of order when we stayed but there is a reasonably priced laundromat in the next block. I would highly recommend this apartment.