I stayed only one night in Carolina&Laura's apartment but everything went just fine. The room was tidy (very comfortable double bed) as well as the two common bathrooms. Central position, close to Santa Maria Novella railway station and to the city center.
Carolina&Laura were very kind during my stay, they recommended few nice places to visit and some restaurants to eat some nice local dishes! Moreover, the communication between us was fast and I had no problem with my early morning check out.
I would totally advice this place to young couples or singles who don't mind sharing some common areas of the house with other guests. Incredible price/quality ratio being in Florence!