This is a nice place to stay in the rural countryside about 15 minutes north of Cagliari. The farm is mostly an olive grove, but also has a fruit orchard, a greenhouse full of vegetables and herbs, grape arbors, and two friendly donkeys! Everything grown on the farm is served at their long, huge, delicious dinners on the terrace (which you must book ahead). Breakfast is simple and typical of agriturismi I have visited. The room also was simple but clean and comfortable -- and wifi worked fine, which is not always true in the Italian countryside. The proprietor is funny and charming and happily showed us around the farm and introduced us to the donkeys, dogs and cats.
There is a working-class town named Dolianova nearby with a shockingly good restaurant -- Il Nostro Mondo -- where it seemed like everyone in town was eating on Friday night. It is about a 40 minute drive through the countryside to visit the UNESCO site at Su Nuraxi Barumini. And the city of Cagliari with its wonderful Museo Archeologico Nazionale and its beautiful beach at Poetto was 15-20 minutes away.
This place isn't fancy or luxurious, so don't expect a precious B&B like you might in the US. It is absolutely Sardinian, which was fine with us. The one caveat is that despite the fact that the gate is just a few meters down a well-maintained dirt road, it is NOT easy to find, particularly in the dark. They really need to put a much larger sign on the highway so you can see where to turn off.