The correct answers are This is a beautifully decorated home. and The house features an open-plan living room.

We use hyphens to connect words in a compound adjective before a noun (like open-plan).

However, there is a special exception: if the first word is an adverb ending in -ly (like beautifully, newly, or brightly), we never use a hyphen! It should be newly renovated and brightly lit.