Featured on the cover of Nano Letters, this recent paper highlights the importance of treating the position dependence of both surface-liquid friction and viscosity for accurate modeling of liquids at interfaces at nanometer length scales. This is demonstrated by extensive molecular dynamics simulations of soft surfaces with adsorbed liquid water phases. By isolating liquid-liquid stresses, true viscosity profiles, and, in turn, interfacial viscosity deficits, can be obtained. Surface-liquid friction coefficients are similarly decomposed spatially to give friction coefficient profiles, and, in turn, generalized Navier friction coefficients that do not rely on arbitrary definitions of the interfacial position. These methods have broad applicability for both nanofluidic and biological systems, where understanding how liquids move in nanoscopic confinement is crucial.