We used a storage locker a couple of years ago when we were getting ready to sell our house - we wanted a place to get rid of the clutter we had, old computers, boxes of stuff, etc. so that when the house was shown they could see the house and not the stuff. The locker was clean, cost about $150 for 4 weeks (8 x 10 room) and was useful. When we moved, we just had the moving company swing by there and pick up our stuff.
We didn't have any cockroaches, spiders or other bugs, so if you haven't decided it, I recommend it. Good luck!