I live in an apartment with both the "front" and "back" doors facing West. I enter from outside, but I immediately run into a wall. If I go into the "front" door, I must turn right and go up stairs into the living room. If I go in the "back" door, I turn left and go up stairs that lead directly to the bathroom. From what I have read, I believe there are a number of problems with these entrances. Should I use only one of the doors? and how do I counteract the wall blocking the chi and the possibility of losing wealth out the back from the bathroom?
Frankly, the rationale for finding the main entrance door is then to `calculate' the birth chart of the house. For this purpose, if we are not certain which door to use, a Feng Shui Master can do a calculation to find out which door is more suitable.
In your case, for the `front' of the apartment, you could `soften' the wall by e.g. hanging a decorative painting to soften the wall e.g. a scenery painting or hanging a scroll.
As for your back door, you can't do much here other than to `hide' the toilet e.g. close the door when not in use.
Center for Feng Shui Research