Carlo is an easy-going, laid-back and super nice guy. He's always ready to help. He can also offer a super interesting conversation about many topics. We talked a lot about Art and Cinema, and he even provided me with some of his own DVDs of Italian movies he considered worth watching. It shocked me how much he trusted me, so that I felt like with a friend.
Regarding the apartment, it's wonderful. It's a super big flat (maybe even too big for just me, since I was on my own), quite old style but super comfortable furniture, and an enormous balcony with views to the sea. Every room has natural light. One of the most surprising things about the place is the amout of books Carlo has there. It looks like a library. There are books about lots of topics, in case you wanna chill down a read a little in the dinning room or the balcony.
The location is quite good. A little far from the very center of Bari (like 20 min. by foot along the amazing Bari's lungomare), but in the other hand quite calm compared to the most touristic areas. Besides, you have Bari's beach, Pane e Pomodoro, super close.
The overall experience was more than satisfying, and I would most probably repeat if possible when (I hope) I can return to Bari. I totally recommend.