The Peruvian apple cactus (also known as columnar, column, hedge cactus and others) has the scientific name of Cereus peruvianus or C.repandus.
Just like most cacti plants, these are very easy to grow indoors and need very little attention. Two of the main things to take care of is using a good draining cacti soil, and plenty of bright light (more about care and conditions below). An issue could arise when the plant matures, and finding a suitable room for it's height, although pruning the top will reduce it.
It's advisable to water this plant more often within the summer and much less, winter time. Like other desert type cacti their natural habitat is dry and they store water within the stems. Water this plant when the soil begins drying out, throughout spring and late summer. In late summer reduce watering until the next spring and allow the soil to be fairly dry.