The flat of Federico is perfect for a vacation in Bari. I can absolutely recommend to stay at his place. It's clean and nicely done up. The kitchen has everything you need including home made olive oil. Federico provided a lovely breakfast.
The flat is located close to Bari Central Station as well as you can quickly walk up the road to the sea side. Around the corner is a nice student's bar called Taverna Del Maltese where you get international craft beers as well as a variety of games or sometimes live music.
Small supermarkets and good restaurants (e.g. Pizzaria Enzo E Ciro) are also reachable by foot.
We had a wonderful stay in Bari.