We stayed at the Farmer's House for 10 days just after our wedding and had a wonderful time. The house is rustic but very charming and the setting and scenery on the Casa Barthel estate is perfect. We loved the relaxing days by the pool.
We did not hire a car during the stay which did not stop us having a good time but should be carefully considered if you stay here as you will have to be prepared to walk along a winding road which is pretty busy and to get taxis (We used the apptaxi app to order). Having said that there is a very reliable bus every 20 minutes to florence, 15-20 mins walk away on the outskirts of Galuzzo (we always got a taxi back up the hill as it is very steep €15-20). There are also 2 restaurants within 15-20 mins walk which are very nice (if you are planning on walking remember a torch) the kitchen in the house is also sufficient to cook simple meals.
All in all a great place to stay outside of Florence to experience the beautiful Tuscan scenery.