the house needs to have a logical structure and the appliances etc need to be arranged logically such that there is a smooth run from the bed to the front door (getting things done along the way on the way out in the mornings :-) plants along the driveway helps them feel happy when they go off to work, too :-)

really helps to have a few people in a house so you can diversify their skills, too. you only need one cook, for example.

i got really hooked into it for a while there. by biggest problem (as it is in life) is in having the friends necessary to make that career advance :-)