Santa Maria is a fantastic villa that is capable of sleeping up to 15 guests. There were 13 of us in 3 families and the layout of the rooms meant that each family had rooms suitable for both adults and children located close to each other. There is masses of communal space, so that even when everyone was around you weren't tripping over each other. The playroom was brilliant for keeping the kids occupied either first thing in the morning or during the heat of the day. The villa was clean and tidy and well equipped, and with the housekeeper visiting daily it stayed that way throughout our visit.
The pool area is very well done. It is clean and tidy and provides shady areas most of the day. The only down side being that it wasn't fenced off/no pool alarm, so we had to keep a constant eye on the children. However, with an adult down there most of the time, that wasn't a big issue. Within the ground, the play area (with swings and a small football pitch) and the tree house were an added bonus.
When booking, we had some slight reservations due to the motorway running past at the bottom of the valley. However, I only noticed it on one occasion, so it isn't an issue. In fact, during our whole stay there was very little noise from any direction. Also the views from the villa are amazing, particularly as the villa is set on the top of a small hill giving 180 degree views to the south.
The owner, Massimo, was extremely helpful. His english is perfect, he always responded quickly either by phone or email and he didn't complain even when asked some fairly ridiculous questions. If I were to take any issue with him, it would be that he needs to get some better photos of the villa on the website as the current ones really don't do it any justice.
I would highly recommend this villa to others, whether you just want to relax and enjoy the views and the swimming pool; or take in the cultural heritage of the area. It's a reasonable distance from Rome and has a number of tourist attractions within easy driving distance - not something we did much, but one of the other families took full advantage.