I went one on one versus an unfortunate gamer who just couldn't kill me. He gets kudos for sticking in the game, though.
Killhouse is a very small map that definitely fits Cage Match, Team Tactical or Free-For-All. Stick to the corners and be silent. Noise is a huge giveaway on this map and footsteps will instantly give away your position in a 1-on-1.
Don't even try to climb the tower in the middle. It's wood and bullets can easily penetrate the thin walls.