Rarely in the cities, Rider houses are scattered along tourist routes, scenic drives, isolated villages, tourist towns, wherever motorcyclists are likely to be going. Often they are sheds tacked on to the back of a tourist restaurant, an old garage on a farm. Most cyclists like to get off the beaten track, and so this is where you will find them.
Look for an invariably hand painted sign in katakana (the simplest of the Japanese scripts) proclaiming to all and sundry the presence of a "ra-i-da-ha-o-su", knock on the door, and there you are.