It’s an established fact that cats rule the internet. And—if you’ve got ‘em—you know they rule your home, too. Mercifully, no matter how big (or microscopic) your city-living quarters are, cats are always a great fit. That said, there are still tons of tips and toys that can make cohabitation easier for everyone involved. After more than a decade living comfortably with two city kitties in a one-bedroom apartment (and with the help of several knowledgeable cat friends and experts), I’m psyched to share these 16 tried-and-true ways to keep city felines happy, healthy, active, eco-friendly, and entertained (and your own possessions clean and safe, too).