My daughter and I had a great time in Ostuni and Silvia's apartment is in a perfect location--just around the corner from Piazza Liberta (the main square in old town) and close to free street parking. The apartment is clean and well equipped, and Silvia very easy to communicate with.
For eating, highly recommend the restaurant Planca, which is located at Largo G. Lanza, 9, in a plaza area just off of Piazza Liberta. We had an astounding meal there. We can also highly recommend the olive oil tour at Antica Masseria Brancati (2000 year old trees!) and Egnazia--an archaeological site and museum with artifacts and ruins going back to the Bronze Age and including the Greek and Roman empires.