There´s are a CC and a Tray Folder, for completely appointed 
house you have the include the CC Folder into your Mods Folder 
otherwise the Content won´t show in the House.

Mod the Sims have made a Tutorial - Go there

Also crinrict have some Helps,Tipps & Tricks in different languages

Make sure the “moveobjects on” cheat is turned off before placing lot To install, download the RAR file from the link below. Extract the folder and copy its contents  into your
My Documents/Electronic Arts/The Sims 4/Tray folder.
If you can’t see the lot in your Library, make sure to check “Include Custom Content” under “Advanced” options in the Gallery DOWNLOAD RAR file **If you don’t want to install it using the Tray files, you can also find it in the Gallery under
Origin ID ideas4sims-art  {for now}

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