There's no other way to arrange the furniture? If you post a floor plan (hand drawn is ok) showing measurements of furniture, walls, window width and doors, maybe there is another solution.

But if you don't want to do that, I'd just get some nice looking shades of your choice (bamboo or roman) and not worry at all about covering them with draperies.

Depending on the size of your window, you might have to outside mount (better for light control, I think), because to inside mount might require a custom size.

I have seen drapes hung at a window such as yours. They used a decorative rod with a finial only on the end of the rod away from the wall. The rod was hung next to the wall (with out the finial). If you like shades, that would be fine also but I guess I prefer the softer look of curtains in my bedroom.

Lowe's has some decent light blocking and light filtering pleated shades. You take the measurement in and they cut to size. A few screws later and you'd have them installed. Then I'd do erinsean's suggestion for some nice drapes.

A shade and no curtain would look fine! I second the idea of going to Lowe’s or Home Depot and having them cut to size. They have pretty good blackout blinds for not a lot of money. If light is a concern to you, then definitely go for outside mount. The light will definitely sneak in through the edges if you do inside mount.

It really depends on the look that you like. I do not use blinds/shades as window treatments. They are functional not decorative. If you need privacy and blackout you could get an inexpensive shade and cover it with a pretty curtain.