Light: This hairy fella likes to be a bright room in indirect sunlight. Or by a window which gets the morning sun.
Water: He's from the rainforest, so he's one of those rare cacti species that need regular watering. Little and often is key, trying to not let his soil dry out completely. Stick a finger in his soil regularly, and if it's moist, best to wait for a bit before quenching his thirst.
Always reduce your watering in winter during the dormancy period.
Height: Currently he's upright, but he'll soon grow to be a beautiful hairy trailing plant – picture a head full of dreadlocks if you must! He'll also bloom in the summer with little white flowers if you're lucky.
PM tip: He'll enjoy a good squirt with a fine mister occasionally to remind him of home. As like many houseplants, he can be mildly toxic if ingested.