I have a steel gun safe in an indoor temperature-controlled room. It isn't the thick-walled kind to withstand a fire, so it isn't airtight, and not as susceptible to condensation issues as a fire safe. I also have a couple of smaller fire safes but they are mainly for documents and so forth, not firearms. I keep a big desiccant pack in each of those. My "gun collection" isn't extensive or made up of collectible guns... so I see my gun safe as more of a big toolbox.
Long guns and handguns are in there uncased and not in a gun sock or anything, in the open air. If a handgun is in there loaded, it's in some kind of synthetic holster.
Inside that safe, I also have some plastic ammo boxes for storing ammo. I have a desiccant pack in each plastic ammo box.
I also have a quick-open pistol safe of similar construction, with a couple of holstered handguns I use for carry and home defense.
I use a combination of rust protectants on my guns, with Eezox being the primary one used on barrels and pistol slides, and Hornady Oneshot being the one used in polymer pistol frames, rifle trigger assemblies, etc.