Golden Bell is one of my go-to's for Vietnamese. It's convenient, it's consistent, it's reasonably priced.
When my weekly craving for pho needs to be satisfied, I often hit Golden Bell. The broth is not oily nor overly sweet (I do not like pho with a sweeter broth). The beef is sliced thin and is not gristly. I would prefer it to be more rare, but it does cook in the broth, which is always piping hot so I suppose I could eat it faster.
For those vermicelli dishes - order one that comes with the spring rolls on top - they are some of the best that I've had.
Service is always pleasant, though depending on the day can be inconsistent in terms of speed or english proficiency.
They do have a small patio out front which is excellent for people watching along 17th, though the tables are a tad small for my liking.
Honestly, if you like Vietnamese and you live in the Beltline, stop by this place and try one of their many, many delicious dishes. I've always left happy and satisfied.