I have a closet for my laundry so looked into this. ELectrolux front loaders have a recessed bottom so they can be pushed up against the wall. I had a few inches to spare so ended up with an LG toploader for my washer due to closet door side clearances.

Georgette, is that the house your husband grew up in? I live in an old farm house that my husband grew up in and it has been fun making changes. That door of yours is great and would look really good repainted. I hear that people have painted their formica counter tops, you could try that with your sink and backsplash area. Can you re-plumb and re-wire into that closet area and use it as a laundry alcove? Removing the sliding doors for good. I think it would look nicer than having the set in front of the windows. Is that closet at a load bearing wall. Because laundry sets should be set up against a load bearing wall, unless they are sitting on concrete. Thats because the sit where the floor is strongest and most resistant to vibration. So, the closet might not work in your case, unless it is a load bearing wall too. Though it kind of looks like a plan stud wall. The wall your set is at now is load bearing because it is an exterior wall and they have to be load bearing.

What do you need in your laundry space. I like many of the ideas that others have posted. I would suspect you need hanging space. Ironing space. Storage space. dirty laundry hampers. storage for brooms, and vacuum possibly. If you go with a built in, I would do generic sizing for machines, so that you can switch out brands. The best idea I think is to have side by side single set in basement and another set near the bedrooms. The side by side allows the water shut off and drain to be above the counter for easy access. You might have to move out the dryer for vent maintenance, unless you go with a ventless model. You absolutely need access quickly to water valves and dryer vent, and electrical outlets. I don't see that in your plan. I have a small built in cabinetry and w/d on my main floor. It is perfect for our family of 2. When I planned for the main floor built in, I did all the design myself. I have an access to one side to get to the water shut off valve, drain pipe, and dryer vent (for clean out). I can reach into the lower cabinet open area to access the electrical outlets. I have about an inch on either side of the built in, and it is not a problem sliding the set out. I do not have a pan under the set, after a lot of thought. My machine pump clean-out is in the front of the washer, so no need to move the machines. When I was moving the machines in and out during the remodel, it was no big deal to slide the machines out. But that is a rare instance. There are several inches at the top of the machines. This set up is custom to my Miele set which is of a smaller design. The room was a constraint for size. I am not sure if a Bosch set will fit, but that could be an alternative set for me in the future, if needed. I always shut my water off when we leave for a few days. I also have a double stacked set in the basement of used machines for my DH farm clothes. I always shut the water off after my weekly farm clothes wash up.

Your situation reminded me of a laundry room remodel done by Gwen on the Makerista blog. She had a similar layout and switched to stacking on the back wall. I thought her room was stunning. I'm not sure how close her room size is to yours, but maybe you could get some inspiration. I've included a picture from her finished room and a link to the blog entry. If the link doesn't work, you could just Google "The Makerista Laundry room" and it will come up. https://www.themakerista.com/the-laundry-room-makeover-blue-white-black-toile/