This guide assumes you have minimal knowledge of Feng Shui, cannot work out the 8 mansions or flying stars for the building you are looking at, and need to keep the selection criteria simple.

Look For :

No missing sectors.
House 3 rooms wide by 3 rooms deep preferrable for easy sector allocation.
Square or oblong shaped block.
Faces onto a single street, no intersections visible from house, no better view in a different direction.
Fences on all 4 sides if possible, front fence is optional but preferred at a lower hight than other 3 fences.
Good facing direction, according to kua number.
Living room in the facing sector.
Bedrooms and dining room placed in good sectors according to your kua number.
Front door in the facing sector.
Wide entrance outside and inside door.
Each Bedroom must have free wall in Health or Best direction for occupant. (Crown of head against wall).
No trees or poles in direct line of the door.
House on other side of street does not have a pointed roof, with the point in line with your door.
Carport/garage on side, with its own roof. Best if not attached to house at all. (even a half an inch gap is enough).
White ceilings.

Avoid :

Missing sectors in the house/apartment. (If you have an odd shape but can see 3 rooms wide and 3 deep, then its ok).
House at the top of a T junction, or the end of a dead end street.
Triangular shaped blocks of land.
No slant ceilings. All ceilings must be flat.
Doorways in the north that are all glass.
Main doorways that are all glass, too big or too small.
Houses without fences around them.
No stairs with holes between each stair. Either as a stairway to your home, or inside your home.
No bathrooms under ANY stairway.
Secret arrows pointed at the house.
Beams protruding from ceilings or protruding walls inside the house.
Any house with blocked flow of chi to the doorway. This includes carports in front of the front door.
No kitchen or bathroom in NW or N sectors, or stove in the NW of the kitchen.
Bedroom only has walls available in bad direction for occupant. (crown of head against wall).
No electricity towers or overhead wires above the roof level of the building.
No hospital, cemetery, abandoned buildings or anything that would be too yin close by.
Garage under main roof.
Missing or broken down rear fence when you cannot replace it immediately.
Multilevel apartment buildings. These are just too complicated if you cannot do 8 mansions or flying stars.
The end apartments in long lines of shared wall apartments. These often have multiple potential facing directions.
Apartment buildings that are not square or oblong shaped. Especially avoid L shaped or weird shaped.
Loft Apartments.
Front door looks onto mountain, back door looks onto water.
Ceilings that are not white and cannot be repainted immediately.
 

Special comments :

If you have a career, then the North sector must be a good sized room that is kept clean and tidy, well lit, well temperatured, and reflects the symbolism of a great career. If you choose a house with a toilet in the north sector, you are asking for your career to be flushed down the toilet ! If the north sector is missing, you are choosing not to have a career at all !

If you have a business, then the North West sector must be a good sized room that is kept clean and tidy, well lit, well temperatured, and reflects the symbolism of a prosperous business. If you choose a house with a toilet in the northwest sector, you are asking for your business to be flushed down the toilet ! If the north west sector is missing, you are choosing not to have a business at all !

Listen to your gut ! :)
Your brain may be driving your choice of a new home, but your gut has instincts which work even when the brain does not have information to understand what the gut is saying to you.
Is the home your looking at, saying to you "Welcome home, I've been waiting for you" ? Or "I guess you might be ok" ?
Is your reaction to this home, "Yes, I can live here" or "What a great place to live !" ?
Choose a place that makes you feel good.

When you find a place that makes you feel good, take note of WHY it feels good. Because after you move in, you need to reproduce the Feng Shui that you selected the place for, after the owner has removed everything that was there for decoration.

If you choose a place that feels good with the intention of changing everything, you have chosen the wrong place.