The flat was really comfortable, and is exactly as described. By foot, the old town is at 40 min, and the sea is at 10min. There is also a bus station and a train station very near the accomodation. The flat itself is beautiful, and very clean.
Angelo is a really nice host. He was reactive and helpful, and knows the city very well. Thanks to his advices, we have visisted Polignano A Mare which is a beautiful town near the sea. He also gave us a lot of advices when it comes to restaurants and monuments to visit.
I won't hesitate to book this flat again if I come back to Bari : ) Thank you Angelo :)