I know Costa Paradiso very well and know the diving centre there also.
The owner Poppi is a very nice guy. A little bit crazy but great. I have been there for 4 year in a raw and know pretty much all the dive spot. My actual girl friend and mother of my son was actually working there as dive master before becoming instructor. What you have to do there is just prepare your gear then the staff will do the rest. Also when you finish the dive and have to go back into the rubber dinghy you give your gear and then you go up. No effort at all.
All the site (approximately 40) are reachable between 2 to 10 min with rubber dinghy. Maximum depth you have is 40 m (± 130 feet) so no risk to escape for the PADI restrictions. Plenty of cave, walls, red corral, lobster,
You want find plenty of fishes but the caves are really nice.
June is great as there are not so many people. Italian are in holliday during the month of August. You can also book with them . Usually they have good price at least when I did with them.
Here below the link to their web site
http://www.costaparadisodiving.it/contattaci.htm
The web site show you the possible English version. Beside the introduction all the links are than in Italian.
If you go there do not hesitate to give my name. They know me as Barchetta.
If you have any further question you can PM and will be glad to help.