Hi Cessnino,
Naples Air Center is approved for JAA training under the UK CAA.
To confirm this if you browse to the following pdf document on the UK CAA Website and browse to page 17 you shall find them and their JAA ATPL Ground School listed.
http://www.caa.co.uk/docs/33/SRG_FCL_APPROVEDFTOS.PDF
As for the school themselves.
I have only had experience with their FAA CPL/IR training. Found them very good and am going back at the end of June for some more training (FAA Multi Engine AddOn).
Best wishes,
Charlie Zulu.