Katerina's place is beautifully situated on Kamari beach in Santorini. It's about a 20 minute ride from the ferry terminal, and given that taxis are fairly cheap and plentiful in Greece, it's easy to get to.
The house itself is beautiful, functional, and perfect for a relaxing vacation. It's a five minute walk to the first bus stop in Kamari, so easy to visit the island of Santorini and other cities within it. The house itself has everything you need to cook, plus many board games in case it rains, and great Wi-Fi.
Katerina herself is prompt, professional, and extremely hospitable and kind! When we come back to Santorini this is the only place I would want to stay at.