I hadnt dived for 6 years and was able to do a refresher dive to get the basics covered again which was really relaxed and everything was well explained. We then went for a longer deeper dive which was great.
Diving around Paros and Antiparos is great. Water is warm and visibility is excellent (<20m). It's really a great activity to take a break off the usual beach-taverna-siesta combo, or to pass your PADI diplomas.