I actually love the combination of timber, jute, rattan or patterned blinds with white sheer curtains. It's especially lovely if you want the option of either blocking light or letting the most in without letting your windows look too naked. These photos may help you decide:

To add texture and softness to a room i would always recommend a curtain.. For bedrooms I always recommend a blockout with a sheer curtain hung very close to the cornice .. Depending on the “fall” of the fabric.. ( how it sits) your window treatment professional will recommend a style ( double pinch pleat, reverse pleat, s fold) but they will recommend the best pleat to showcase the fabric you choose .. However here is a cheap but smart alternative. Firstly.. very rarely do I hang either curtains or blinds within the window “reveal” I always go at least a minimum of 150mm above the window for blinds and generally always up to the cornice for the curtains. When you hang in the reveal you lose the height and a portion of the view.. You want to highlight a view so this is why I’m suggesting it! Plus it always makes your room look bigger. But .. if this is not for you then Alternatively you can get a sunscreen blind hung within the reveal and hang a curtain above roughly 150mm about be the reveal. The curtain should “frame” the window on either side of the window frame wall .. NOT covering a good portion of the window.. you want most of the fabric to sit in the wall when open. The combo blind / curtain is your most economical.. But I have always always hung curtains in bedrooms without fail.. It gives you that element of texture and luxe that is very hard to beat!!

Your window treatment plan sounds both chic and functional! It's great how you've found a balance between privacy and a minimalist aesthetic. If you're still exploring options or looking for affordable alternatives, you might want to check out https://www.fullsource.com/sport-tek-clothing/ for some inspiration. Wishing you the perfect blend of style and savings for your townhouse!

Yes, the steps are a small challenge. My suggestion is to work with that angle of the steps. If you would like full block out curtains, angle the hem of the curtains with the steps. With the width of the opening, and having the curtains pull to each side from the middle, there will be quite a bit of bunching. So I would suggest one curtain fitted across left hand window. Then the remainder of curtains pull from the door opening panel, back to the right. Depending on our much 'block out ' you require, I think the following product from luxaflex looks your style, but would not bunch up on the sides as much as traditional curtains. https://www.luxaflex.com.au/products/blinds/lumishade/ Still working with the angle on the steps.