"very reliable and perfect timing!"
caught a flight from Heathrow to athens, arriving mid afternoon, then caught the bus straight to Rafina from right outside the airport. We were a few hours early for the ferry but you can get on 2 hours before departure. Absolutely brilliant, it left on time , and was a v smooth quick crossing. Very impressive to watch them docking at Andros too, but be warned they literally only stop to drop of passengers for about 10 mins, so don't fall asleep!