As the other reviews mention, this is a very centrally located, charming place to stay. Maria is extremely sweet and thoughtful--we are gluten-free and she even had a GF beer in the fridge for us upon arrival. The space is very stylish and makes you feel like you're living like a local. We didn't get to enjoy the tiny terrace because we were too busy exploring (it really is an easy 10-minute walk to the train station; it was so easy, we took a train to Florence for the day and ambled back in time for bed).
But it looked cute. Not a deterrent for us but worth noting: you'll need to climb four flights of stairs to access the unit, the water can be on and off--in the shower, it took time for it to come at all one morning and takes some time to warm up; and the pipes in the bathroom (or something thereabout) make a whining noise periodically throughout the day and night, which is may be a problem for light sleepers. Bonus: WiFi is strong and reliable; there's lots of amenities in the bathroom, including a hairdryer and shampoos, etc.; and the price is right!