This church is easy to miss. You have to walk up the road towards the Acropolis and pass directly past the entrance and walk into the woods of Filopappou Hill. Just on your right you’ll find this wonderful church.
And if you are energetic, walk to the top of the hill. You’ll find the best view of the Acropolis in Athens, and you’ll be completely alone (so maybe take somebody with you – just in case).