The server we had was very friendly and super helpful to me when I let him know I was vegetarian. He double checked that they had vegetarian broth available before he confirmed to me that they had what I could eat.
The vegetarian pho, which you have to specify you want vegetable broth because it will come with chicken or beef broth if you don't, was pretty good. It was a tiny bit more bland than I am used to, but with jalapeƱo and lime it was perfect.
I will definitely go back next time I want Pho!