Tell me how to build good: Lounge Edition!

[WhoStole MahCar]

make a floor plan and layout of what you want to do, it will help you proportion the place.

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[The_Original_Derp]

Visualize a good lounge and try and emulate that in game.
Also, trust your gut, once you've done it the way you like, see what others don't like and improve off of that.