Kostas and his family were absolutely wonderful. I didn't meet Kostas and Joanna themselves but I did meet Kostas parents. They didn't speak english at all but they were so sweet, and full of charm. It was definitely a great welcome.
The place itself has all the amenities you need. As I mentioned before, his parents didn't speak much english, but they had a handy tablet in the house that showed videos of everything you need to know about the place-- which actually came in very handy.
The location is perfectly situated right next to the beach, which is actually one of the better beaches in Santorini. There are plenty of parking which was great because we ended up getting a rental car. However, if you do not plan on renting a car, this area is a bit far from the main touristy areas. It took about 20 min to get to fira and 40 min to get to Oia. Also, there is a small strip of restaurants which close late so it works great for those late night munchies! All in all, if you're looking for a quite relaxing area away from the hustle and bustle this is the place.
I think what I really appreciated about this the most was Kostas's and his family's hospitality. Towards the end of the trip, after checking out, I realized I left something behind. We had limited time to get to the air bnb and back to the airport-- but luckily Kostas was readily available when I messaged him in a panic. He even offered to mail my lost item to the next place.
Anyway, Thank you Kostas and Family!