Elena is one of the nicest hosts we've ever met. She showed us everything that needed to be visited in Firenze. She even helped us call a taxi in the early morning that we left for Venezia (Venice). The house is very clean and comfortable. Our room was just as expected. It is very easy to reach their house by bus, just follow the direction. The bus ticket is 1.2 euro if you buy from the kiosk and 2 euro if you buy from the bus driver. You can walk to the city centre from their house if you want ( about 30 - 40 minutes depend on your speed ). Or you can go there by bus ( about 15 minutes ) and in the city centre, everything you need to see is so close to each other.
I highly recommend Elena & Tigran's house for anyone :-) !