All good tips guys.
I'd like to add a very traditional Som tam restaurant right by phloen chit.
Madam Somtum
888/19 Phloen Chit Rd, Khwaeng Lumphini, Khet Pathum Wan, Krung Thep Maha Nakhon 10330, Thailand
+66 2 651 5899
https://goo.gl/maps/A4a4t1D3j3Q2
Sorry I didn't take any pictures but there are some available on the Google page. I have eaten here twice the som tam is excellent, made to your preference of spiciness, the grilled pork neck is heavenly the kind of melt in your mouth levels of tenderness. My personal favourite though was the Tom Yam pork bone, the creme de la creme of Tom Yam if you ask me, and here it is spectacular. It's a thai restaurant so expect a certain level of spiciness, stuffed my face here at lunch twice and not for more than 300 baht.