Hi,
I write content for apartment websites. I agree with the idea that the term luxury has been used so often in the industry that it's become cliche. Some alternatives I use throughout the copy to denote the idea of luxury living include: chic, classy, contemporary, distinguished, elegant, exceptional, expert, exquisite, fine, flawless, immaculate, polished, pristine, smart, sophisticated, stylish, tasteful, upscale
PS: Just be sure the apartments really are luxury apartments, otherwise the use of luxurious words comes off as pretentious.