It's confusing I know. This cafe was previously a separate location but now is housed in the same site as Pho Bosa, which is an excellent vietnamese restaurant on its own. Now, you can order from either menu. Look for the Bosa Boba Cafe items which include a bunch of sandwiches, milk tea, flavored tea.
The brisket banh mi is as good as you've heard. The baguette is soft, unlike the rather dry version you tend to get at Lee's. House made fish sauce is available on the tables to add to your sandwich.
Hokkaido milk tea and thai tea are rich and delicious. It seems you cannot go wrong with the BBC menu. Can't wait to try some more sandwiches here.