You can't go wrong staying at Helen's place. Her and her team are second to none and were so welcoming, helpful and genuinely caring. My daughter and I stayed for five days and had the sunset right from our private balcony. Santorini is a beautiful place and we felt very luxe staying in Oia but not having to pay $400 Euros to do so.
The air conditioning works so well which we definitely needed some days. Netflix works which we, again, definitely needed some nights after long days in the sun.
Long story short, stay in Oia with beautiful views and world class service (seriously, cannot stress this enough!) for a fraction of the price!