Location: Just a few minute's walk to the sea, and relatively close to Rome. Best to hire a car; since the bus service to the nearest train station isn't great, especially in the evening. Once at the train station, though, you really are 15 minutes from St Peter's Square and just a few more minutes from Trastevere. Plenty of local/small supermarkets, restaurants, gelaterias, etc although it's a couple of kilometers to the nearest large supermarket.
Grounds: A nice spacious setting, with a lovely garden and outside seating areas. We enjoyed using the outside BBQ/pizza oven.
Villa: No shortage of bedrooms (there were 11 of us, and we didn't need some of the rooms), and there's plenty of living space. Having a downstairs bedroom was useful giving that we had a wheelchair user, although there are a couple of small steps to negotiate from the road to the front door. The top two rooms have lovely balconies.
Value for money: The unit cost per guest (especially if at maximum capacity) works out very reasonable. If the owner wished to make any improvements, we would suggest:
(1) the kitchen is very small for such a large house, and would be better as part of the open plan living space; also, upgrading with a microwave, kettle, etc would make a difference
(2) the boiler might need upgrading (we struggled to get hot water, particularly on one side of the house)
(3) the aircon isn't in every room (not too much of a problem in May/June but I would imagine it might be in August)
(4) the beds were fine although mattress and pillow covers, more pillows would make a difference
Owner (and local representative): helpful with information before our stay, and responded well to a couple of minor issues that we had whilst there.