Day/night roller shades work the best. Easy to clean, not noisy when you travel and actually help quite the inside when the noght shades are down. The can be purchased almost anywhere window coverings are sold and are not very expensive.
I replaced mine(day night) one at a time from Ebay when the price was right. Matched color per room/slide and if they where an inch or two narrow, I shimmed the sides of the valance by adding a small block of wood.i,e, 56"x35" about $65 each new with shipping