Close to Shibuya, good price
In this beautiful Shibuya basement you can try ramen and tsukemen a la tonkotsu (pork bone).
In terms of price it's pretty good, about 5 euros for ramen and 7.50 for the tsukemen, and given the location, about 10 minutes from the Shibuya station and the famous Hachiko statue, you really can't complain.
In this place you pay a set price and you can choose the amount of pasta you want, and the largest size (Chou) is truly enormous. In each table there's a basket of hard-boiled eggs to put on the ramen and each one is about 40 euro cents.
For those who don't know, the main difference between the ramen and the tsukemen is that in the ramen the noodles go in the soup while in the Tsukemen they give you the soup and noodles separately and you dip the pasta in the soup. You can also choose whether you want it hot or cold.