The location of the apartment is fantastic, really close to the Basilica San Nicola. I have stayed quite a few times in the old city, and this was perhaps one of the best locations. You can get a taxi close to the apartment (cars aren't generally allowed in the narrow streets) and everything is close by. The apartment was also really quiet given that you are in a city. Do take note that there are 54 steps up to this top floor apartment, so don't rent this if you have mobility issues. You can safely leave pushchairs at the bottom of the stairs!
The apartment itself is good, but a little basic. There are two large bedrooms - note that you you can only access one by going through the other, which might not suit everyone. There is a small kitchen and bathroom with a small bath and separate shower (towels were provided). All of the beds were comfortable. We had an initial issue with the air-con, but this was quickly fixed and it worked well. My only small gripe was that the kitchen was slightly under-equipped, which made preparing food a little challenging (lack of chopping board, sharp knife, only 2 mugs, no kettle, poor quality saucepans etc). Getting more than 3 people around the kitchen table may also be challenging! However, if you are only visiting for a couple of days and you plan to eat out all the time then it will suffice. There is also a washing machine, but you have to daisy chain the electrics to plug it in!! Our hosts were able to supply us with a good quality travel cot for our toddler (thank you). There is a terrace in front of the apartment, but there is a sign asking you not to use it, which is a pity, but to be honest it's too hot to use in the summer anyway.
We only met our hosts once at check in. We met at the piazza and were shown to the apartment. All other communication was done via the AirBnB app. Upon arrival we were asked to fill out a form. This was new to me as everything is covered in the general T&Cs. Also, there was almost nothing in the cupboards when we arrived (literally only salt and pepper), so plan on shopping once you have arrived.
In summary, this is a basic but fantastically located apartment. I would consider staying here again.