We stayed at Trullo Lavanda for one week in July.
Things you should know are:
1. you definitely need a car to get around
2. you can go to a communal pool that is amazing just 15 minutes drive away. You can hire sunloungers for a half day or full day and can eat there. We went in the week and were often the only ones there but on the weekend it can get busy so best to book your sunloungers in advance (as they are limited). The place is called Guigra - http://www.giugra.it/eventi-live/piscina/
3. The other thing to know is there are only 2 taxi's in Cisternino so we had problems getting back to the trullo on a Saturday evening - luckily the kind lady at Information had her boyfriend drive us back otherwise it would be a LONG walk!
The two taxi numbers are 338 76 00 369 and 337 93 13 84.

The trullo itself is nice - it is homely and is well equipped although we only had one fan and it was over 30 degrees when were there - we were two couples so could have done with one fan each as the trullo is not so cool in the heat, especially at night.
Also, on our last day a workman came to do some loud drilling at around 7am and we were not told this was going to happen so the last lie in was impossible. We also had a flexible check out time but at 11am was told to leave by 2pm (we had been planning to leave at 5pm) and also that we would have no water for an hour. It was very short notice for both and so we had to go early to the airport and had a very long, wasted day as we couldn't do as planned.

All in all the host Anna was lovely but just a bit of notice on that last day would have helped.

I would recommend the area - it is a wonderful little place and lots to explore.