Bidet is god-tier. Get one -- even a cheapo cold only one is good, but if you have a few hundred saved, Costco often has sales on a pretty solid Toto model that's pretty no-fuss. I had a Tushy once, and getting the hot water from the bathroom sink was a pain.
Also, learn how to use drywall anchors for hanging shelves and shit -- you can buy a 4 dollar tube of spackle when you move out and patch any holes yourself.