I stayed 3 weeks in tiberios apartment and it was fantastic! I totaly recommend this place. tiberio is a nice host, ready to help always.
The apartment is small but very nice and good equiped, as well as the kitchen. It is perfect for a single person or a couple. They provided different sets of towels and bed sheets. The host has also a housekeeper that is ready to help you.
The only thing you need to take into account is that the internet is very slow and that you are not allowed to download heavy fields, videos or movies.
However, my experience there was amazing and I would stay there if I come back to Florence.