About Carla, she was a great host and very welcoming, flexible as far as Check in/Check out. The one responding on the messages was Cristiana her daughter. She was responsive and a good mediator between myself and her mom who spoke little English. Myself and Carla were still somewhat able to communicate with my basic understanding of italian. 0Nonetheless, both very helpful.
As for the room, clean. Bed: Comfortable. Wifi: Good. Bathroom: nice hot water.
About the positioning, its a block away from the tram that takes you straight into central florence. A 20 min tram ride from Central Train Station, Firenze S.M.N, will take you to her house as well. There's also a supermarket about 2 blocks away to load up on supplies.
Would definitely recommend again.