Loved staying at Simona's room during my short stay in Florence. I chose her place mainly because of it's proximity to the train station, but even after arriving at her place i walked all over the city. The city center is only a 15minute walk from her place.
The pictures make it appear a bit larger than it is, but since I was by myself, it wasn't a problem for me. The bed is very comfortable and the bathroom, while small - is fine for one person and newly renovated.
Simona was very friendly and super organized! She met me with a packet of information with city maps, coupons for complimentary breakfasts at a nearby bar, restaurant recommendations and suggestions for places to go or free things to see and do.
As someone else said, the room/building is noisy with neighbors and hall traffic, but that's just Italy! Every apartment or hotel I've stayed in a bit noisy and I think it adds to the ambience of this old city. :)

All in all, a great stay with a fantastic host, with convenient location. I'd highly recommend.