Situated inbetween Kabukitcho the red light district (quite tame from what I've seen), and the Korean district, the flat is in an old building but it is well renovated, well lit, and was very clean. The shower had some cracked paint and not perfectly clean walls, but it was ok. Beware that like so many Japanese accomodations, the window insulation was terrible, but especially so and the neighbourhood is very noisy with annoying advertising trucks until late and drunk people shouting through the night. I'm not very sensible to that so I still slept correctly.
All in all a good place, friendly host and pretty good value for the price I think.