Gather all your cleaning and interior home upkeep supplies into ONE location, like a small coat closet. Coats can be moved to coat hooks/racks in the entry to free up this premium storage space.
Put Together a Dusting Caddy : Dusting + Furniture Care Essentials - Clean Mama
Under stairs cleaning cupboard possibility
Basement bathroom door for cleaning supplies. Kitchen to basement door for pantry items. Back of girls' door for barbies. Inside girls' closet for shoes. Inside my closet door for belts and scarves. Entry door for shoes, mittens, etc.
29 Sneaky Tips & Hacks for Small Space Living via Listotic - w/ Use the space in between the studs as extra storage!