Great apartment and Elena is a phenomenal host. As hospitable and helpful a host you could find. Here are some top line ratings (1-5 with 5 as best)...
ACCURACY (of Booking/Costs/Pictures): 5. Elena's description and pictures are as she had listed. No surprises. NOTE: Hot water does exhaust after about 20 minutes. But Elena is very communicative about this. As long as you wait 20min between showers, you'll be fine. More than that, this place is perfect for 1-2 people. Balcony is KEY! Place can be a bit noisy due to the metal trash bins outside. It's loud. Nearby restaurants will through their glass and metal trash there resulting in loud crashing noises. But I didn't have much trouble with it. Plus Elena was nice enough to provide us with earplugs.
CLEANLINESS: 5. Everything was tidy, clean, and functional. LOCATION: 5. perfect location. A few steps away from cafes, shops, restaurants, grocery, and VERY central for sight-seeing.
HOST: 5. Elena is great. One of the most hospitable hosts we've ever had. Easy to reach, explains house rules and answers questions accurately, and she's incredibly nice. Gave us some solid recommendations and a good lay of the land too!

Overall, I'm happy to recommend this studio to those staying in Florence. Such a functional and easy place to stay in and travel from.