It's difficult to get to your gun quickly when you are attacked in the middle of the night if it is in a safe.
@Undecided:
Guns used for self-defense need to be secured but quickly accessible... there are some devices designed to keep a gun reachable within seconds, but out of the hands of a child or unwanted users. For example, a drawer-sized safe, pistol pad (links to your alarm system), etc.
I don't know if this AK-47 was their home defense weapon, but In my opinion, that wouldn't be my first choice... If it's one with the fixed stock, it's not very versatile to use inside a home, plus the recoil may be too much for some users to handle. An AK-74 may be different, especially if fitted with a collapsible or movable stock.
For home defense, a handgun in 9mm or larger caliber, with a couple of extra magazines handy, or a defense style shotgun (short barrel, pistol grip, no buttstock), or an AR-15 with a collapsible stock and 16" or smaller barrel (careful there not to have a SBR without proper ATF stamps) would make a better choice than the AK. If the gun has rails to attach a flashlight, even better.