Your kitchen looks great! A round table is much easier for people to walk around in a tight space. I think some sort of table would make that space more complete. I don’t know the size of your space however if nothing big fits, then a small round bistro table with just a couple of chairs would look nice. I’m sure you can find a small round table to fit there. Just map it out with removable painters tape on the floor for both the table and chairs and that will give you a better idea.

will bar stools tick under the ledge? I think a small round bistro size table may be all you can fit. I'm guessing people won't sit at bar level when someone is cooking at stove, right? so then, it would be nice to have a spot to sit at the window. Do you eat dinner in the dining room? This window spot is just for quick breakfast or snack or coffee? You also want the light to be centered over the table so if it's closer to the bench (smaller round), you may need to move the junction box or swag the light