Nice room. Liking all that natural light you'll have with that window wall.

Use a double rod as wide as the room covered with a wood cornice. A 2"x6" five inch long board on each of the walls beside the window and a third in the middle could support a single long (room width 1"x6") cornice board painted white.

Put white sheers on the inner rod.

Use three panels of curtains or drapes -- one on each side covering the wall and the vertical outer edge of the window frame and a third panel in the middle -- with the curtains/drapes covering as little glass as possible.

Try to find a lighter version of the same color as that of your sofas for the drapes or curtains or at least that color somewhere in the print.