Maria's Trullo is a bit hard to find (enter TRULLO PIETRALUNO into Google Maps, then follow the road on that point). The Trullo is really well kept and seems like it's just been renewed. It's got everything you need - 2 bedrooms, a bathroom, dining room, kitchen (incl. silverware, plates, glasses... coffee machine, stove...).
MUST have a car, otherwise it will be extremely hard to reach it. There is also very low signal (but that's reasonable due to location). The location is good for visiting other cities (i.e. Alberobello, Martina Franca, Locorotondo ...).
The Trullo is a standalone (not part of a village or another building), with nice terrace and surrounding garden.
Maria was really nice and even gave us a baby watermelon and some tomatoes.
She doesn't speak English, but she can show you everything in Italian too. Also knows how to use Google Translate! :)