This cactus loves the sun, so aim for a bright room and direct sunlight if possible.
Cacti can cope with very light watering schedules so make sure you don't overwater. During the summer months you can water twice a month if the soil has completely dried out. During the winter months you should take a break from watering completely.
Hard to kill?
9/10 - Cacti are pretty solid house companions and unless you overwater them then you should be onto a good thing with this guy!