We stayed 3 nights at Gianvitos apartment.
In all our stay, Gianvito has been in contact with us, helping us to ensure everything was ok.
Also, the aprtment is clean, big and very beautiful. It is quiet although is very well located (5' from the city center abd 5' from the supermarket). The terrace of the apartment is a nice place to have breakfast.
We would deffinetly recommend it for tour stay in Polignano.