Jeff,
A lot depends on the room. My darkroom is in the basement. If this is secluded from the cats, mice could be a problem. They are here. They love mat board and print paper, with or without images. The wet side of the darkroom can be very humid (surprise) depending on ventilation, heat or air conditioning. High humidity, lack of ventilation = mold on anything.
I store print paper and mats in steel, mouse tight, flat files in the room next to the darkroom. This room also houses the furnace, air conditioner and dehumidifier. Open packs of print paper are in paper safes in the darkroom. Finished prints are on the walls or in archival boxes (from Light Impressions) on the first floor. Camera gear is in closets on the first floor or on tripods in "my" room. You are of course welcome to see all this when you are here in September.
If you haven’t already found it, there is a wonderful thread here on darkroom portraits with pictures and 616 posts as of this writing. (there was a url link here which no longer exists).
John Powers