The room is clean and modern (as pictured), with double pane windows. It's deep inside the building, away from the street, so it's quiet. The only noise comes from an interior courtyard, which wasn't bad.
The apartment is small, I can't imagine more than two people staying there. And if you're big or have mobility issues, I would recommend something else. I'm just under two meters, and had to take my time getting to and from the bed in the loft and in the shower.
Having said that, my wife and I stayed three nights and would stay again.
The apartment is in a good location, very near the train station (Tip, if you get off at Quinto Sella it's only a 5 minute walk.), and a short walk (~10 minutes) into Bari Vechia. The host was very responsive and gave us great recommendations (especially restaurants) that improved our stay.