This is a rave review. Umberto's place is the best experience we have ever had with Airbnb. The location is magical (looking onto the main square of Barivecchia) so you feel at the centre of local social life and Umberto, as well as being a great guy, has done everything possible to make his place comfortable and welcoming. We were lucky in that our visit coincided with the Festival of San Nicola (Bari's patron saint and the original Santa Claus) and so we could see the parades of his statue, accompanied by a large brass band playing jolly oompah music, pilgrim processions and the nightly firework displays, but even at other times you would have a unique experience of traditional Italian urban life, not to mention a private rooftop terrace to observe it from with, of course, a glass of local wine in hand. You're also within easy reach of many characterful restaurants. Anyone who appreciates the characteristic charms of Italy, especially the South, will love this place.
There are a few warnings: a) the stairs in the apartment are steep and people with mobility problems would find them difficult; b) the bathroom is small and plus-size people may feel cramped in there and c) the square outside is busy from early morning to late at night but this is Italy and Italy is as it is and Italians are as they are. And all the more so the further south you go.
We're coming back as soon as we can!