I think I agree, table is a bit big for the space. How about a long rectangular wood table with chairs or some type of bench? The bench running along that window...

In one of my projects, I had a breakfast nook with a round table too! That table you have in your pictures does look like it might be a little too big for that bench. Maybe if you find a bench that matched the size of the table or vice versa, it would work better for the room. I'll attach a picture of how I went about the breakfast nook for my Connecticut project. Hope this helps!