1. Take the Metro Line 3 (Blue line) from Athens International Airport towards Egaleo.
2. Get off at Syntagma Station and transfer to the Metro Line 2 (Red line) towards Elliniko.
3. Get off at Kallithea Station and exit towards Kallirois Ave/Λεωφόρος Καλλιρρόης.
4. Walk along Kallirois Ave for approximately 10 minutes until you reach Kallirois 26 on your left-hand side.
Total travel time is approximately 1 hour, depending on the frequency of the trains.
The cost of a one-way ticket is €10 for adults and €5 for children under 18 years old. Please note that these directions are for guidance purposes only and may be subject to change due to transportation schedules or other factors.