http://www.dianping.com/search/keyword/2/0_%E7%BB%BF%E8%8C%B6%E9%A4%90%E5%8E%85
Green Tea restaurant is basically exactly like this "The Grandma's" place. It's cheap, the food is good, the decor is nice. Maan Coffee is another good example. Beijing has plenty of chain restaurants, it just takes more than blind wandering (or trips to Hangzhou) to find them.