Good to hear you enjoyed your meal there, @vinouspleasure. Charoen Krung Road, being one of the oldest thoroughfares in the city, has quite a few old eateries worth a visit, besides Prachak:
Bangkokians will know to get their khao niew moon (mango with sticky rice) and khanom babin (coconut pudding) from Sor Boonprakob ([Bangkok] Khao niew moon (mango with sticky rice) from Sor Boonprakob Panich, Charoen Krung) on 1474 Charoen Krung Rd.
They will also buy the traditional Thai desserts like khanom chan (a steamed nine-layered sweet pudding), khanom mo kaeng (a steamed egg custard flan) and khanom piak poon (a firm sweet pudding topped with shredded coconut) from Khub Luang Nart nearby on 1478 Charoen Krung Rd.
Besides rice congee from the 6-decades-old Jok Prince ([Bangkok] Pork Congee from Jok Prince, Bangrak.), “kluay khaek” or Thai-style fried bananas from Jay Noi, braised pig’s trotters from Jay Pon and “Roti Mataba” from the 7-decades-old Muslim Restaurant on 1354 Charoen Krung Road, one can traverse Charoen Krung and see new cafes side-by-side with old Chinese-style coffeeshops with hawker stalls. Very interesting neighbourhood indeed.