Decorating-wise, we need new carpeting. I'd also like to hang curtains. We've been here 20+ years and only have mini-blinds. I've bought curtain rods a couple of times, but never get around to buying curtains.
Structurally- I'd replace the windows. They are casement windows, the kind where the hinges are on a vertical edge of the window and they crank open. It means we can't have a window a/c unless we make some structural changes. Also, the windows are too tall for their width, so the crank mechanism isn't really forceful enough; they are a bear to open and almost impossible to close tightly. While replacing the windows, I'd also replace the door that leads out to a small sitting porch. It's not really a sitting porch at all- big enough for just one plastic lawn chair. I'd get rid of that and the door, and just put in another window or some wall space.
In the attached bathroom, I'd take out the oversized, useless soaking tub and put a washer/dryer in there. Then I could use the smallish laundry room as an office area or storage space. Sure would be nice to have an office.