I have walked past this stall many times, without being aware that this is a celebrated roti venue! And I like Roti! In the evening there is usually a roti cart further down Saladaeng, which I have noticed.
On the opposite corner of Saladaeng, in this photo behind the motorbike taxi drivers, is a fantastic old world family run chinese noodle soup restaurant. It hasn't changed at all(not the menu nor the decoration) in the 25 years that I have been going there. The grandfather has now retired("been sent to rest in the countryside") but the grandmother and her children/grandchildren carry on. The site must be worth a fortune, but when asked whether they have considered selling, the grandmother replies that they had offers but she is not interested as "what would I do with my time and all that money". Her life is based on seeing people enjoying eating their food. She is happy as is.
I expect that when she retires the younger generations may feel that it is time to move on........
Best to avoid at lunchtimes as local office workers pour in to the limited space, and they close mid afternoon or when the day's noodles run out.