The location is very cool and central with plenty of bakeries/cafes and small shops around just 15 minutes away from the old town. However, it gets noisy even with closed windows (was not a big problem for us but maybe you should consider this). The place was a little bit dirty, we had a feeling that there was no proper cleaning before us (some trash from the previous guests, not very clean dishes and some dirt in the bathroom). The bathroom could have been better: the walls of the shower cabin are falling apart a bit and at times there is little to no hot water.
But there are a lot of advantages too. The communication with Elena and Francesco was quick and smooth, Francesco was very helpful and responded to all our questions about the place and Bari. Moreover, the flat is artsy and cosy, we enjoyed the place very much. Also it is clear that this is not a hotel but a flat of a real person: the kitchen had things necessary for meals (eg coffee pasta sugar oil) so we didn't have to spend a fortune in the supermarket to eat at home.
In general, we would recommend that place (and come back) if it gets a little more clean :)