Gladis and Juan Saquique are living the American dream, after two years of living in a nightmarish basement apartment to save a $15,000 down payment for their fourth-story Hackensack, N.J. condominium. But these two Central American immigrants have very little to fill their new 25 x 13 living room. Designer Tom Zemon sets out to adorn half the space with an elegant seating area anchored by an electric fireplace. The second half of the room will feature a baby grand piano.