Been here a few times and really think it's the perfect lunch place! Good location if you are near the lock or coming from the subway, but still a turn off from Götgatan.
I love Vietnamese food, and eatnam won't disappoint. For lunch they also offer 2 day's, one with meat and one vegetarian.
The venue is large and airy, and if you want to go here in the evening, there is an alcohol permit for those who are in the mood for a big Saigon!