This property is perfectly located walking distance (down a very steep hill) from Porto Ercole. We stayed there with eight people for a week in June. The pool is beautiful, and the views of the water and hills are more beautiful than the photos can show. The gardens/orchard are stunning and charming. However, rooms are smaller than pictured, and you should go expecting some inconveniences compared to US travel, and the place shows some wear.
The kitchen is well-equipped but small (really only room for 1-2 people cooking at a time), and indoor eating space is nonexistent (4 people only). But with lovely weather, you can eat outside every meal.
The main two bedrooms in the main house are perfectly adequate. The bedroom attached to the main house, behind the kitchen, is fine, with a more newly renovated bathroom, but doesn't attach to the main living area. Hot water is limited and shared, and you have to flick a switch to turn it on. All of this is fine for the adventurous traveler. Our only serious concerns were that the second building, where we slept 3 people, was musty and had some termite issues. So: 5 people can live here very comfortably, and enjoy the beautiful pool and surrounding area. But much more than that, and you'll have to decide that a few folks will be less comfortable in the out-building.
We have just came back from our wonderful Holiday in Italy. We spen 4 days in Rome and then we came in this outstanding villa in the South of Tuscany. Porto Ercole and Porto Santo Stefano are two very characteristic villages. The villa is located closer to Porto Ercole but Porto Santo Stefano was just 5 minutes by car. We took also the ferry to the Isola del Giglio, fantastic! There are many equipped beaches in the area, the closest to the villa was 5 minutes by car. But I must confess that we spent most of our days relaxing in the amazing swimming pool, having lunch in the patio. The garden is beautiful and well-kept, we enjoyed the peaceful and secluded atmosphere. Inside the villa is very comfortable, there are plenty of bedrooms, all airy and spacious. I would definitely come back next year with my family but for more than 1 week!