Stephanie Sokolov has been operating Stepanie's on Newbury since 1994, and decided to open Stephi's on Tremont just over a year ago. The contemporary decor, congenial atmosphere and sophisticated menu have made this American bistro a neighborhood favorite. Artistic touches abound with an unusual mix of curlicue wall sconces, folky and retro art pieces, and faux crocodile leather ottomans amid a backdrop of simple lines and earth-toned upholstery.