Went here on a Sunday afternoon and it was not busy at all. Pretty calm and quite atmosphere in the restaurant as there were only couple other groups eating at the time.
Ordered the number 23 and 2 over-easy eggs (broken rice plate with bbq pork). The food came out pretty quickly and was made perfectly--eggs were still runny (not something that every place can do). The food isn't anything fancy, and neither is the restaurant. But it does not disappoint! It tastes great, and it leaves you pretty full after you finish all of it. On top of all that, you can't beat the price. Less than $10 for rice, bbq pork, and 2 eggs.
Definitely coming back here for Vietnamese food. If my experience was any indication of what this place is like, it really is a hidden gem.