Sienna Miller — who says she’s trying to make smarter decisions in her life — is bunking with a platonic pal at 285 Lafayette St., where Ian Schrager still has an apartment and where David Bowie and Iman live, reports The Post’s Jennifer Gould Keil. Miller also forced a red-faced New York Times to correct a story that mistakenly listed Sean Combs and the late Heath Ledger among her famous boyfriends.