The sleek, bright lobby of Atlantic Theater Company's Atlantic Stage 2 and its scrappy, dimly-lit stage may as well be entirely different worlds. The intimate space has become a convincing studio apartment (Arnulfo Maldonado designed the set), and cushions in lieu of front-row seats make houseguests of the audience. The coziness borders on voyeuristic: There's a plainly visible toilet at the front of the stage, a bare mattress on the floor nearby, and candles and string lights casting their bits...