We spent a week in Montebono in September 2013 and wish we could have stayed longer. Accommodation is very comfortable, spotless and beautifully located (be careful - sharp drive up but stunning views thanks to the high up location).
Reggello town is 5-10 min drive away and there are a few shops, cafés and restaurants. We had dinner in Montebono on two occasions (you can pre-book it) and it was lovely! They grow their own vegetable and also make their own olive and wine. Yummy!
I could not fault the place. The only little thing I wish was different was a very cold swimming pool.
If we ever return to Florence we will definitely stay in Montebono again.