Really good Vietnamese
Why locals love it
I used to go there nearly every day. They only have weekly meals, mostly 3 (vegetarian possible) and some standards like soups. Their curries are simply amazing. The food comes very quickly, the place is tiny though.
Why you should visit it
They serve great shakes and fruity drinks (like passion fruit) as well. You get a main course for 5€ which will satisfy you. Everything is freshly made. Only thing that is not too tasty is their standard Pho soup. Just a little boring.
Green curry if available or their Vietnamese summer roles.