My husband and I stayed at this property for 3 nights in the first week of October and had a great time!
-Location: When we got there I was a little confused on the exact location because if you look up the address in Google maps, it shows you a bit closer to the Duomo intersection (about 3 doors down) but its a few more than that (still insanely close). If you are on Via Ricasoli and have the Duomo at your back, the property is on your right, past the gelato place La Strega Nocciola. If you reach the next intersection (Via de' Pucci), you've gone too far.
-Size: As others have mentioned, it is a studio apartment and was perfect size for the two of us. The bathroom was the biggest we had while staying in Italy and there was plenty of hot water.
-Safety: I felt very safe in this apartment as there are a few layers of doors to get through to get up to the apartment, and once there the locks on the door is truly like a bank vault.
-Kitchen: Only thing we found off was that the kitchenette really doesn't have much. There were no plates or bowls, and for silverware we saw only 1 steak knife. As for cups, there were two champagne flutes and that was it. We weren't planning on cooking so it wasn't a problem for us, but if you are looking at this property on the basis of being able to cook there, this is good to know.
-Food: If you are looking for a grocery store, the closest one that we liked was Sapori and Dintorni Conad on Borgo S. Lorenzo which is just two blocks west. It has everything you need! There is also an Eataly on the block in between on Via de' Martelli (we didn't go while we were there).
-Other: If mosquitoes love you, make sure to bring bug spray and/or hydrocortisone/itch cream. My ankles got eaten up at a restaurant in Florence (not on the apartment terrace). Also the wifi was a bit finicky but I found that if I unplugged it from the outlet, left it for a few minutes and plugged it back in, it worked fine! Lastly, the washer machine is outside on the terrace - it is the covered box next to the loveseat. One thing I didn't realize was that European washing machines have really long cycles compared to American ones. The 'eco' cycle took 3+ hours to wash our clothes. Just something to note if you are timing your laundry. There is no dryer which is common in Europe, but there are two drying racks provided for you to use which worked out perfectly.
-Must do: Our favorite thing was climbing the Duomo for the view! It's 400+ steps and a bit of a workout, but it was very worth it. Do not do it you are claustrophobic.