Rule of thumb: this size is good for storing more than four rooms worth of items.
Tips for storage: Keep goods in containers and plastic bags. Keep delicate fabrics and mattresses covered and away from walls to avoid condensation. Leave an aisle down the middle of your unit so you can access your things more easily. Don't stack things so they lean or fall on the door which will inhibit operation. When you open your door, unlock, move latch to left, push up on ribs of door to get it started while you are standing upright. This will help protect your back from straining. Then pull your door open from the middle handle to keep even pressure on the side tracks for smoothest operation. Make sure the latch engages with the side jamb before applying your padlock (Otherwise your unit will not be locked). That sometimes requires a small adjustment moving the door up, down, in or out while you slide your latch over. Inform management of any issues with your unit, We want to help you and resolve any concerns, if any, quickly.