Responses in order of your priorities:
1. Kalashnikov actions are one of the most reliable small arms designs. Ensure it is consistent with the original designs, especially the triple-interwoven springs.
Determine if it has a hard-chromed chamber and barrel, as much of the lower priced ammo in that caliber is made with lacquered steel cases.
2. It is easy to clean, not that it requires it to any significant degree, except ensuring no obstructions in the barrel or large debris in the lower receiver.
3. You should be able to consistently keep it in a paper-plate sized target at 100-yds, depending on ammo and the relative degree of precision built-in by the manufacturer.
4. Neither the weapon or cartridge are suitable for interior home defense, unless that is all that you have, in which case it'll just have to do.
5. It's reasonably priced - however you could also get an SKS for about the same or less money. Their accuracy tends to be much better than their AK-series successors. It is good as a plinker and fun gun, but if home defense is the primary function - reconsider a shotgun.
