Great location, nice small room (with a beautiful bathroom) only a couple of small comments below.
Very relaxed and quiet, especially taking consideration it's proximity to the centre of Florence.
Room belongs to the son of Elisabetta, and his stuff is still there (books, shoes, ect), which is OK - the experience is more like crushing the couch of one of your friends rather than an official accommodation.
You can use the shared facilities, like the kitchen - we haven't used those tho, so I don't know if there is e.g. room for stuff in their refrigerator, or if you can find e.g. wine glasses (we did not), so you'll need to ask for these.
What I'd definitely replace tho is the mattress and the bed grid - maybe the whole bed itself - for this price I would expect a non-creaking, comfortable place to sleep after the long walks and late Italian dinners :)
Another thing is the lighting in the bathroom - such a lovely bathroom, and still: the bulbs have some kind of an annoying issue of not being able to switch on if they were switched off recently...
We did not harass Elisabetta with these, so that's on us, so she might as well have could have fixed those, if we took the time to let her know.
But overall we enjoyed if VERY VERY much, and I still recommend the studio - and of course the city is awesome!