You will find the Home Showcase icon on the World Map and once there, you'll see the following:
You can see the list with the current best home owners and can pick one to explore in further detail. You can read other user comments and suggestions on the decoration of the home - you can leave your feedback too!
Before you can leave your opinion, though, you have to see the home, right? So, click on Go to Home and you'll find yourself there within seconds.
I visited benmax11's home - he's done a pretty nice job, I'd say! What do you think about it? If you haven't seen it yet, you can do so right now :)