Why don't you square the island to get some drawers on an end.....sink on one side and seating on remainder one or two sides. Drawers are best storage. Keep window.

Do you cook or order in/go out for most of your meals?

If the later, I'd add a window even if it means losing some space, so you have nice light for reheating.

If the former, however, this is a VERY small kitchen. I would think through exactly what you need in a functional kitchen and then think through exactly where you're going to put everything? Forget the microwave, what about the pots/pans/dishes/mixer/etc., let alone the food? People certainly make do with smaller kitchens, but I'm not sure I'd want to plan one when building a home from scratch (and not one in the downtown of a major city).

I don't cook much. I get by with a small kitchen now. The new kitchen will have about 80% of the cabinet space of what I have now. Maybe I will go with the low window. If I go with low windows, do I need to make it symmetric and put it in both sides of the stove?

I would start editing your kitchen to the essentials now and make sure you can get by with 80% of what you currently have before you commit to this plan.

If doing the low windows, I would make it symmetrical.

I am downsizing. I should be ok. I may have trouble if I try to sell the house tho.

I would try to find more cab space elsewhere before I took out the window. Before you commit to low windows, see if you can go hang out in a real kitchen with them first. Some people find them extremely annoying - remember those peninsulas popular in the 80s that had the cabs hanging down over them? You'd be bending down to try to talk to your guests on the other side - same principle.

Keep the window. If you already know you want light, you will miss it if you substitute a cabinet. Below the cabinet windows are nice, but they don’t have the expansive light that a full window provides. And in some kitchens, they accentuate the visual weight of the upper cabinets.

The real problem is the microwave. Is there a decent way to put microwave in front of the window?

Do you have space in the island for a drawer microwave?

Unless I sacrifice seating. I was going to seat 4 people on the island two on each side.

You have a nice sized dining area just steps from a very small kitchen. I'd absolutely give up island seating (probably altogether, but at minimum two seats of it) for more cabinet and microwave space.

That's an idea. Just giving up one seat will make room for a drawer microwave.