I opted to visit this place after reading great reviews on tripadvisor.
No doubt about the best idli, I have ever tasted. They were so soft that they were left like fresh butter.
They have 2 shops in Madurai, Westmasi road shop is less than a 1 km from temple south gate, while other shop is about 600 meter from East gate of temple.
Just a word of caution, their infrasturture is very basic. No AC, very basic sitting arrangement. Just by looking from outside, I would not have ventured inside. In my group of 6 people, some people didn't like it.
I would say, visit this place, if you really love the food, else you can skip.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.