Monopoli is a nice, little town, easily accesible by train from Bari (about 30-40 minutes) with great beaches and restaurants. Highly recommended if you want to avoid the tourist crowds. The apartment is just a 10 minutes walk from the station and it's near the center and the beaches.
We were in a rainy period and our bathing suits and towels were drying pretty slow, we were lucky that there were lots of towels in the apartment and we had a spare bathing suit too. There were even a hair dryer in the studio.
Roberto was very welcoming and helpful. He let us stay in the apartment till 6PM on our last day which was really helpful with all the luggage we had. He always arrived on time and texted back in couple of minutes.