Advice
The devil is in the detail – make readers feel as though they are standing shoulder to shoulder with your character, seeing what she or he sees. And the more ordinary the house, the more the reader will be able to relate to it and that will add to the tension.
Describe a smell or a sensation (air freshener just been zapped….?)
Don’t rush ahead. Tease out the truth: don’t deliver it in a dollop and if you intend to write more than a thousand words you could even have a mini revelation that leads readers to make false assumptions