Wonderful stay at Martina's apartment! Very well decorated, clean and very comfortable, it is located right next to one of the best ice creams in Florence. The duomo is some 5-10min walk. You can find all groceries near the Ponte vecchio at the CONAD supermarket, or before that in local alimentari. Down the street there is a nice bakery and a place that sells fresh pasta.
We actually have nothing negative to point, everything was perfect!