There's also a fairly nice one at Xueyuan Pai, west of Beijing Normal Uni. Being renovated now, but it's supposed to reopen by the end of the month: 咖啡猫 (Cafe More).
They have 5-10 cats and kittens wandering around, and it's a nice neighborhood spot, with kids and grannies stopping in to pet the cats. It's especially nice to watch Chinese kids learn how to interact well with animals.