I created my first Unity game a couple months ago called Nightly Escape. I am currently in the process of creating Alpha 1, which does include some new furniture objects, such as a large cabinet for hiding in the living room, dining room, and upper hallway. I also added a small table with chairs in the kitchen and that is about all the new furniture. Now, I want some ideas for new furniture ideas for Alpha 2 that will help make it less bland and give more spots to hide items within to give more of a challenge. Currently, Alpha 1 is a bit more challenging now than the older versions where I had to disable the AI.

In case you don't want to download the game to play, here is a screenshot of the living room. The one room I have no idea of what to put within. I know what I can put in the Child's bedroom though.

I have also placed two ceiling fans as well, which I feel is missing something as well, so if you got any ideas, let me know.  Actually give me some improvement ideas for the current objects as well.

It's hard to suggest furniture without knowing the purpose of the room. I suggest searching for images of living room, kitchen or whatever room you're going to create then examine the furniture there. You can pick furniture you need based on the images.

I play a lot of hide-and-seek with my 10 year-old son, so here are some  furniture-related hiding places for a person to hide in:

Closets (to include shelves within the closets) and especially closets with clothes in them. 

Bathtubs (behind the curtains)

Behind doors

Behind curtains

Under tables (especially if they have tablespreads to conceal what's under them).

If you can get your character to go prone that would open up more hiding places:

Wedged between a couch and the wall

Under the bed

Underneath a pile of laundry

Inside a large box or suitcase

Hope this helps!