From Athens International Airport (Eleftherios Venizelos), take a taxi, KTEL bus or drive to Rafina Port (about 30–40 minutes).
From Rafina, take the ferry to Gavrio Port in Andros (about 2 hours).
From Gavrio, drive towards Batsi (10–15 minutes).
Just after the last exit to Batsi, drive 100–200 meters further on the main Gavrio–Batsi road and turn right towards the sea.
Google Maps location (https://maps.app.goo.gl/GKjbbcm1XwxFoY7z9)