I really enjoyed coming here with my sister. It is easy to walked past so be sure to look out for the yellow signage outside, to the right of 7/11.
We speak almost no Thai but the sister of the owner was there who was able to tell us roughly what the dishes were and how spicy! We tried a variety of curries on rice. They were really great - lots of vegetables too!
I recommend Kob Chai 1 completely! Check it out!
Cons: Slight hard to find if you do not know what you ar