This place is marvellous. The room is very cozy and all the amenities worked perfectly. I especially loved the dryer and the portable WiFi ;-) But what I liked most were the people! This is an amazing gang that makes you feel like you've been living and partying with them all along. I was actually quite sad when I had to leave and I'm definitely meeting them again.
I am travelling for fieldwork and the room was very convenient for working but also for relaxing. Very quiet area but many bars and restaurants are nearby. The hosts have taken care of everything, even running a website in English with restaurant recommendations and other useful info. Access is easy from both major airports as well as the rest of Tokyo and the price is reasonable.
I'd definitely recommend this place to anyone travelling to Tokyo. Please, everyone stay with the Koji family.