There are a few in our house that I'd love to change, but if I have to pick 1 it would be the kitchen for sure. Ours is so dysfunctional. We moved in last year, and haven't gotten around to fixing it up yet (too many other projects). It has really old, raggedy cabinets. Many don't close properly, they are just old and gross. Plus, the layout is terrible. Its a rectangular room, but only 2 of the walls are being used effectively. One wall has nothing at all on it, and the other 1 is just the stove. I'd love to replace the current cabinets and wrap them around the blank wall so that we could have more storage and counter space and get rid of the awkward blank wall. Plus, the floor is a bit slopy and needs leveling. I'm actually researching right now on possibilities for that that are very affordable.