Grapehouse Koenji is a fantastic place to stay! It's a little outside of Tokyo proper, but that makes the neighboorhood much easier to explore in my opinion hahaha! But seriously, everything was always clean and tidy, the beds were comfortable, and there was even a washer/dryer if you needed it. Grapehouse Koenji is also super easy to find (yay quieter neighborhoods!!). After a day or two you won't even have to think about it! I highly recommend Grapehouse Koenji to any solo female travelers, it's pretty wonderful!