Although I really wanted to answer the truth: I like cake! ;-)
There are many ways to translate Vietnamese sentences. This can be translate as "I like something that is basic."
simpleness có được không?
Yes, although "simplicity" is more natural and common
I like simplicity.
Simplicity would be nice in this world
I think it should be I like simply
"Simply" is an adverb and cannot be used as the object of a sentence. You should use the noun "simplicity".