My girlfriend and I had wonderful stay here. We were given a really friendly welcome and got some great recommendations for our holiday (you have to get gelato from Vivoli and dinner in Fagioli!) The apartment is very spacious. It had room for all of our stuff and was equipped with everything we needed - the washing machine, coffee pot and freezer were a big help to us. The bathroom is a highlight too.
Our only problem was that the internet stopped working after our second day and didn't come back for the rest of the week. We didn't need it that much because Florence has so much to offer but it would have been helpful for playing music or planning our days or checking in for our flights home.
Aside from that our stay was great. I'd recommend the apartment for anybody. You can fit 3 or 4 adults or a family comfortably (there's a futon).