Me quedo en casa. have to add more characters cuz it is short :)
Answer:
You can do a couple different of ways depending on how exactly you mean to say it.
The simplest way is to say "me quedo en casa" which is the literal translation. However, here you would be omitting the noun which is not wrong and is valid in Spanish. However, you could do "yo me quedo en casa" and it would also be correct.
