Best OC area to move to in your 20s?

I’m moving to SoCal at 25 for a work opportunity! Where is a good place to move in your 20s with a decent social scene aka people of similar ages who are open to make friends? Maybe vibes similar to Brooklyn, Chicago, Austin, Seattle, Portland, Silverlake? I’m hoping for an artsy-ish scene with cute coffee shops and walkable areas. Budget is $1,200 maybe $1,300 for the right fit and super willing to live with multiple roommates.

I apologize if this is a dumb question, because I know very little about California so I’m also posting this on the Inland Empire subreddit since I’m not sure which is a better fit. I'm working somewhere between the 2 areas.