Present Simple with next week

Question

Is this sentence correct? If not, why?

He lives in the flat next week.

I pointed out to my friend that this does not sound right. I said it should be

He will live in the flat next week.

or

He is going to live in the flat next week.

Answer 1

"He lives" is present tense. It creates a confusing situation where the listener hears present tense in the context of a future event.

"will live" and "is going to live" are both future tense, which makes more sense in the context of the thought you're trying to communicate.

Answer 2

No, it's not correct you can't say future things with present indefinite rule.

And then two cases:

1. If you are sure about that he is gonna live there. Then you can use "will live/is going to live".
2. If not sure and just assuming use "may" He may live in the flat from next week.

Hoping it will help.