This is a hole-in the wall restaurant as other reviewers have noted. Honestly I feel like those are the best places to get pho- in Vietnam people literally have pho for breakfast on the side of the street.
I got a large bowl (I think of the special but with no tripe!) and it came out almost 5 minutes after, stuffed to the brim with meat and broth. The broth was amazing and the cuts of meat felt so authentic, especially with the rare beef actually being rare. I think my favourite part is the herbs that they serve it with. There's basil and bean sprouts along with another herb that my parents use a lot at home but I'm unsure of the name in English (that's when you know it's legit!!).
Honestly for how small and dingey the place is the service is really great, they're attentive and efficient. It is a cash only establishment though, so come prepared!