We booked this cruise (because of Zakynthos) in May. Third time on Armonia, great ship, especially for kids. Certainly this is a pure family cruise, don´t think about taking it as a couple with no kids😄 You book it to bring maximum happiness to your 8 year old.
I think it is a great route with excellent ports. Check if it is better to start from Bari or Venice, for us Bari was cheaper, but that is different from cruise to cruise. And before you think too much about Aurea suites, check if they are available on your date. Often sold out.