Great place, fantastic location, Minami is a wonderful host. Very communicative and clearly cares about her guests. It is small, just a room with a futon on the floor and not much else, but the futon is pretty comfortable and for a solo traveller, it's all I need and the price can't be beat. Like most Japanese places, the walls are rather thin, so if you happened to have a particularly noisy neighbour, that could be an issue. I didn't have any problems, but Minami provides earplugs should it be one.
All in all, a great stay. I will definitely be looking here again next time I find myself in Tokyo. Thanks!