The apartment, space, accomodations, and cleanliness were perfect. I had some difficultly at first finding the place, but Niccolo was very reachable and stayed in contact until I found it. He also helped clarify the difference between residential and business addresses (red vs black/blue address colors as they can have the same numbers but different colors signify home/business; make sure you understand this as it can be confusing in Florence).
Niccolo's instructions and recommendations on what to eat/drink/see were great. Shopping hot spots and sights are not far, and great restaurants and bars very close by.
Outdoor patio was perfect for our morning coffee and breakfast too.
Wifi was a bit spotty and worked better in certain places (worked better for my Mom who has an iPhone, but not so well on my Samsung).
Door locks definitely work and the place/area is safe. But, they can be tricky to open...especially the outer and most inner door. We got used to them though and figured out the tricks to opening them. :)
Overall, of all places we stayed in Italy during our travels...this place was one of my favorites. Excellent host. He also called us a taxi to the train station when we left since the ones we contacted were all busy.
I highly recommend this place. I loved it and would stay again! :)