When Kyle Schuneman moved into half of a Victorian duplex in San Francisco’s Pacific Heights neighborhood, he didn’t know how long he would live there. What he did know, however, is that he felt duty-bound to make his mark on the apartment. “Even in a rental, it’s about making a space that works for you,” he says. With these big-impact, low-commitment decorating ideas, he proves that living well isn’t just for homeowners.