A truly magical villa, just book it. We had the most amazing time at Malteza.
The location is second to none. The villa is at the highest point of Imerovigli (insulated from all the cruise ship traffic in Oia and Fira), steps to wonderful restaurants (recommend Athenian House, Mezzo (although not open 2019 season), Throubi) and Skaros Rock.
Christina makes an amazing fresh Greek breakfast every morning and the views from all three terraces are breathtaking.
Other Santorini recommendations: Imerovigli to Oia hike; Akrotiri; Perissa Beach; Captain Ted's Sailing; Dimitri's and cliff jumping in Amoudi Bay; Santo Winery; Gavalas Winery.
There are few places we would visit twice, but Santorini is one of them!