Hi Dave,
There is a guest house you might want to look into called Liberty House. It's a total dump but it is about a 15 minute walk from Honbu and the manager, Masa, is the sweetest guy. They will probably want you to stay at least amonth but you may be able to talk them into a shorter stay. Unlike the place Dave I. recommended, they don"t have a bath but a shower where you may have to wait in a long line. But hey, you're there to train, not to smell good, right?
Charles Hill