We've had 5 cats over the years. Only 2 right now. I used to let them outside, but so many bad things happen to cats outside, not to mention the reduction of birds that I rather like in the yard, and the vet bills, and the nasty kids down the street, and the diseases (toxoplasmosis is not a joke), ticks and fleas, and the racooons and opossums and coyotes and mtn lions and roaming dogs and other cats, and the vet telling me my cat was expected to live only 3-5 years as an outdoor cat but at least 13 years as an indoor cat -- well, my wife and I decided to make them indoor. The transition was easier than we thought it would be. Leo and Max lived to be 17, Java lived to be 23! We cried like babies when they passed. Today we have Pandora and Nina -- my son named them when he still lived at home. Great cats will be true family members and enrich your life beyond expectations. BTW, dogs are great too, but don't make it as easy to go on trips. Cats will hang out at home for a week (with a friend stopping by to feed) and not get too perturbed when you return. Dogs freak out and carry lifelong emotional scars if you leave for a 3-day weekend. Thus, we enjoy our friends dogs, but cats are our family members.
Sneaky is a beautiful kitty. Lucky you, lucky cat. It will be a wonderful adventure.