The housing advice in the article is correct - those are the ideal areas. However, it fails to mention the extreme costs and competitive nature of finding a place in those areas.
Living in Berkeley is not a good choice if your internship is in the South Bay. Even if your job is accessible by BART, Berkeley near a BART station is not inexpensive. The nice areas of Oakland are similarly expensive and the not-nice areas of Oakland are a few orders of magnitude more dangerous than the rest of the Bay Area. I used to live in an "affordable" part of Berkeley and had to spend about an hour each way getting to work with walking on both sides + BART. Berkeley and parts of Oakland like Rockridge have their charms, but I do not recommend them if you have the option of living closer to work.
Living in Berkeley is not a good choice if your internship is in the South Bay. Even if your job is accessible by BART, Berkeley near a BART station is not inexpensive. The nice areas of Oakland are similarly expensive and the not-nice areas of Oakland are a few orders of magnitude more dangerous than the rest of the Bay Area. I used to live in an "affordable" part of Berkeley and had to spend about an hour each way getting to work with walking on both sides + BART. Berkeley and parts of Oakland like Rockridge have their charms, but I do not recommend them if you have the option of living closer to work.