Mary Roby The stress of living with her son and daughter-in-law made Mary Roby’s blood sugar spike. But when she began her search for an independent senior housing community, affordable and nice never seemed to come in the same package. Roby, who is 80, said she looked around quite a bit. A one-room place in the Boston area for $4,500 a month had no senior services, a limited kitchen, and was housed in a poorly maintained building. She also knew, through her son’s in-laws, about a high-end assisted living community with extensive services, but it charged more than $6,000. Then she found Shillman House, which was both affordable and nice. “I love it here,” Roby said about the independent senior housing community…