The ’90s may be enjoying an aesthetic revival these days, but that doesn’t mean every one of the decade’s creations deserves celebration. In fact, when she first saw this house from the period, Los Angeles–based AD100 interior designer Mandy Cheng says she remembers thinking, “It looks very early-’90s Tuscan, and in a bad way.” The home—located in LA’s Pacific Palisades—showed off what Cheng describes as “modernish Santa Barbara Mediterranean style” exterior architecture. The interior spaces, many of them double height, glowed warmly with sunlight from large windows. But that glow revealed an array of glaring 30-year-old missteps: the highly polished marble floors throughout the ground level, say, or the conspicuously…