My friends and I have visited At Bangkok restaurant several times (including the time we gave up waiting for a table at the rival restaurant across the street) and I am always satisfied.
The place has a slightly open atmosphere with desks-and-stools seating arrangements that are spacious enough to not accidentally knock other guests.
The food offerings are quite extensive, the serving size is acceptable, and the price is quite reasonable. I do agree that their dishes are very spicy in general, but otherwise the food taste good and of pleasant quality.
During my several visits, however, I can conclude that the service could have been improved, as I dont find the staffs to be attentive. We had to call out several times for an extra serve of rice, and when it finally came, it came twice, as if this wasnt being communicated properly between the staffs. With this limited interaction, I cannot deduce whether or not they are friendly.
I also find that the food arrives at odd intervals, maybe due to the increasing number of customers visiting this place.