The neighborhood feels really, really sketchy at night. I would not recommend for solo travellers. I've lived in Tokyo for years and it's the first time I've ever felt uncomfortable.
The building interior staircase was not lit and felt really dangerous, the bed felt like it would fall apart, and the door to the bedroom requires some coercing to shut because it's kind of off the frame.
The sheets were really clean, but the pillows smelled like sweat.
The kitchen seemed decent, though.
The shower was old, but really clean.