Do you open the windows/ Out? In?

I think you'll have to get either an inside-mount roller shade or an inside mount roman shade because there isn't enough room on the left side of the window to mount a curtain rod. Check out either The Shade Store or Smith and Noble. They have lots of options.

I do open the window in @jck910

@Sabrina Alfin Interiors If i have to open the window, i can pull the curtain in the right side , im thinking ..

I 2nd roman or roller. Check out tonicliving.com for custom romans.

If you want a curtain instead of a shade, you could use a swing arm curtain rod installed on the wall above the opening. like this

Between the ledge and radiator underneath and lack of wall space on the left, I’d say curtains are out unless you just put a tension rod in there with long cafes. Otherwise I agree with an inside mount shade.