I'm going to pin this and put it on my "honey do" list. A pergola offers sun protection without blocking breezes, while its open sides frame the view and establish a sense of enclosure. This pergola was custom-made, but DIYers can build one from a kit.
The whole window will have a one foot wide window sill. I will have to show you the place to get a good idea of things. Basil planted in teacups for the kitchen, cheap and pretty teacups planted with fresh herbs on the window sill.