Love santouka's ramen! I've tried the shio, shoyu and spicy ramens and my favourite is their shio! The soup base is very creamy and rich. The ramen is presented very nicely with all its ingredients poking out of the broth and it is really colourful!
I always like to add a marinated egg on the side and add it into the broth. They also give you the option to choose regular or large sized ramen and also have set meals with a small rice dish on the side.
The only negative thing about the food is that I feel like their ramen got a little soggier as the years passed. I normally prefer a firmer noodle.
The restaurant seats around 30-40 people and I don't recommend going around busy meal times as there's sometimes a wait out the door. Try going just after lunch or for an early dinner to get seated faster!
It's also a great place to eat a quick meal by yourself as you can sit on the counter (which faces the kitchen) and watch them cook the ramen.