The above answer has the best recommendation, which is University Village. Here's some more information about options that definitely aren't scams, but may not have online applications/leasing processes.
Some well-known realty companies include Premium Properties, K&S, and North Berkeley Properties. I personally know Premium's application process can technically be done online/over email, but I'm not sure if they want to meet you in person (since I signed my lease in person.)
Some major apartment buildings near campus, which are run by reputable but greedy companies that jack rent up a bit above even Berkeley market rates, include:
- New Californian Apartments
- Gaia
- The Berk (not sure if this available to grad students)
- Hillside Village
- Berkeleyan
- El Granada (relatively cheap studios available sometimes)
There are a ton more of these "luxury apartment buildings"; you can probably find them on Zillow or Google Maps.
I also agree you should try to add yourself to the Berkeley Housing Facebook group, if you haven't already. Also consider finding a temporary sublet when you first move here (there's usually an oversupply over the summer), while looking for a more permanent place in person.
Take a look at this too, if you haven't: https://och.berkeley.edu/