Ms Ferguson said the cafe's feline staff had been adopted from shelters.
They have a cat psychologist to keep their behaviour in check and staff use pheromone spray to keep the mood purrfect.
And there is still room for three more cats - with the newest addition, a sweet three-legged ginger girl from the SPCA, yet to be named.
Ms Ferguson said being around cats is relaxing, a claim that's been well reported.
A 1999 study found that cat owners had lower rates of heart disease, and the presence of pets has long been associated with reduction of stress and blood pressure.
First-time BaristaCats customer and University of Auckland student Sharni Killoran, 23, agrees, saying it's just the place to relax after a day of back-to- back classes.
Ms Killoran, who visited the cafe last week, said the atmosphere was great.
"It's what I expected -- but better."
She was particularly impressed by the cats' play areas, from the shelves that acted as a staircase up the wall leading to a little cat-sized swing bridge, to the cat adventure playgrounds covered in carpet and sprouting with nest- shaped sleeping spots.
There's even a "hissing booth" for the cats to hide away in, and separate rooms accessible through cat doors for time out.
With winter approaching, Ms Ferguson predicted business to boom even more.
"Coming inside out of the cold for a snuggle with a nice kitty and a hot drink - perfect."