There's a lot of variation in Fremont neighborhoods from sketchy to super-wealthy, so it depends on what you can afford, whether schools matter to you, what you want to be near, etc.

Definitely consider proximity to transit: the current surge in employment has lead to a surge in traffic jams. The three main transit systems are BART, Trains (Ace and Amtrak Capitol Corridor), and the Dumbarton Express bus.

Feel free to ask followups -- I'm a born-and-raised.