Add a bidet to the toilet.
Replace flexible drier vent tubes with rigid vent ducts. And have a couple of fire extinguishes and know how to use them (aim at the base of the fire, under the flames, and such).
Anti-vibration pads for under washing machine feet.
Not so modest and not probably not appropriate for renters: Attic fan (the whole house, giant fan in the ceiling kind). We ran ours for few minutes most evenings through the warm weather season in the second house we owed. It was so awesome that I thought we would always have one. Then we moved to a climate where the nights didn't cool down.
Replace flexible drier vent tubes with rigid vent ducts. And have a couple of fire extinguishes and know how to use them (aim at the base of the fire, under the flames, and such).
Anti-vibration pads for under washing machine feet.
Not so modest and not probably not appropriate for renters: Attic fan (the whole house, giant fan in the ceiling kind). We ran ours for few minutes most evenings through the warm weather season in the second house we owed. It was so awesome that I thought we would always have one. Then we moved to a climate where the nights didn't cool down.
