Im at Robins Nishikoji, and this place is ok, and very cheap too.
Its not Japanese style, its in a way actually quite modest, but the athmosphere is nice. The computer room and tv room are free for anyone to use, my room is a private room - quite small but good for me, theres bed, table, fridge, etc.
This is near Saiin station, so its a few km from here to the center. Its fast to travel by subway/train/bike, but if youre in Kioto for sightseeing etc, then I guess its not so convenient...
->
http://www.ips-robins.co.jp/
Oh, and by the way; even though it says on their web page that no contracts less than 6 months, it works out, for example Im here for 3 months, and the owner just said that he welcomes people even for a few days.