We stayed at Roberto's place for two nights and it was exactly what we needed. The apartment is located not far from the centre of Florence and the Florence Cathedral and Ponte Vecchio (around a 30 minute walk). Although we didn't use it, public transport is easily accessible. It's quieter than the 'business' of the touristy centre.
The room had a double bed and sofa, both were comfy along with it's own bathroom and use of the kitchen and balcony - perfect for breakfast. The entire place was very clean too. We did have to share with another group of people which we weren't originally aware but it was fine for us. There was also coffee and tea available.
Overall, I would absolutely recommend a stay here if you're in Florence for a couple of nights!