Unica B&B is a further distance away (18 minute walk) in comparison to other options but is a better nightly rate too. As the road between these is smaller we've been told it is not recommended to walk and taxis should be booked in advance to get to and from Tenuta San Masseo. Slightly restrictive check in from 10:00 to 12:30 and check out from 08:30 to 10:00.
All'Antica Mattonata is probably the most expensive recommendation but you can see why from their website. Breakfast is included and its only a 13 minute walk to San Masseo however taxis have been recommended here also as the roads are narrow and busy and there are no footpaths.