This is map specific and you must be playing on Haddonfield.
You are not required to own the "Halloween" DLC as all maps are free.
Myers house is the blue one with a pumpkin and a sign that says "STRODE".
http://images.akamai.steamusercontent.com/ugc/81466563019622...The generator should spawn on the second floor.
Some times it will spawn in the room right off to the left of the stairs and three people should be able to get on it but sometimes it will spawn a corner where only one person can get on it. So watch out for that as someone else could beat you to it or f you're playing with friends and you all want to get the achievement.
Other things to note about the house is that I only see it spawn in the middle of the map and thus the killer is likely to pass by and hear you working on it.
The killers basement with the four hooks and chest always spawns in this house. Another house also has a basement but it's not the one that you see on every map.
The back window leads to a balcony, so if the killer is around then you can jump out to there and hide out. If a chest is spawned in the corner against the wall, you can even hide behind it.