Curtains for window in attic

[AprilShowerz]

How would you put up curtains in an attic where the window goes right up to the ceiling and the radiator is underneath the window?
Also what length? I like floor length but that'd cover the radiator and the heat.

Apologies for rubbish quality photo, it is taken off right move as a similar window.

We have white wooden venetian blinds on hours wnich look very stylish, but have you considered shutters?

I have shutters on mine! Thought about it a lot and had Venetian blinds, but shutters are the best for blocking light and not covering half the window when open.

Not the best picture but you get the idea:

Also there is a radiator under the window there.

And we had a black out blind behind them to make it completely black out.

Ooh I hadn't even thought about shutters.
I don't normally ever close the curtains so they're just there for decoration, but it seems like they'd block lots of light. Shutters is a good compromise