Tremendous Thai food can be found at Bangkok Thai.
I've come here to eat 4-5 times over the last 6 months and i have yet to be disappointed by the quality of food. I usually go with the tofu pad Thai, which is among the best I've had in the Cleveland area. When ordering meals the waitresses usually ask how spicy you'd like the food, on a scale of 1-4. I made the mistake of ordering a 4 once, which I would to be way to overbearing, and this too coming from someone who has an incredibly high threshold for spicy food. Other than that, a 2-3 will provide a very nice level of spice that won't take away from the flavor of the food.
My only critique about this place would be the service which at times can be slow, and the fact that they don't carry vegetable spring rolls. Nevertheless, I'd still recommend this place if you're out on the east-side and are in search of some good Thai food. Don't let it's location in a random strip mall on Mayfield fool you. Stop by and enjoy.