There is an english version on the way unfortunately and even a Ju-on the grudge 3.
I've seen the japanese Ju-on II, and it is quite a funny movie.
Definately recommended! But after a while there will be so many flashbacks and time shifting that you really have to keep attention.
[EDIT] Oh, I have no idea where the hell they shot the exact movie in Japan. You should use google if you really need to know..
I don't think anybody knows.