Surviving
She hunts by sound. Walking is quiet; running, slamming doors and the piano are not. Crouching makes you nearly silent.
In the dark she is half blind, but a flashlight in her face gives you away. Turn it off when she is close.
If she sees you, break line of sight and hide in a wardrobe. If she watched you climb in, it won't save you.
When she spots you she screams first. That second is your head start: sprint, turn a corner, and she is slower than you at full run.
Read everything. The house tells you how to leave it. The map in the corner turns with you: the white arrow is you, the gold star is your next goal and the moving gold line is the way there. Press M (or tap the map) for the full map of both floors. A small light marks the object when you are close.