We had an amazing time in Elenas apartment! It's an easy 15min walk from the train station and once you are at the apartment you are literally in the center of all the major attractions. You'll get to all the sights within a few minutes of walking. The place itself was fully equipped and we didn't miss anything in the two weeks we've spent there. Kitchen, Laundry, etc everything was there and in excellent condition.
There is a grocery store right across the alley that has everything you'd need, and then again, you'd find plenty of Italy speciality stores nearby. Would definitely recommend this place for a good time in Firenze.