Duccio's apartment is ideally located, close to transport links and near to many of Florence's must-sees (the Museo Archeologico is close by, and well worth a visit).
Don't be put off by the climb to the fourth floor, as the accommodation on offer is comfortable and clean, with the shower deserving of a special mention! As others have noted, there is some street noise, so best to pack some ear plugs if you're staying in the roomiest (and fanciest) of the bedrooms.
There's a discounted breakfast available in the handy neighbourhood bar on the ground floor (we ate and drank there several times).
Although he wasn't around, we'd a couple of messages from Duccio, just checking that we'd everything we needed.
All in all, a great base for a holiday in Florence: we all enjoyed our stay, and would stay here again.