A great location for a great price! G-Stays is in the central most ward of Tokyo and is located around the corner from the nearest station making it incredibly easy to travel to anywhere in Tokyo. The staff is friendly and speaks perfect English. The help desk is always open and offers you free water bottles, coffee, tea, cream, and sugar any time you need it.
The only negative thing I can think of about G-Stays is that it is in an extremely noisy location. There was construction going on during the day in one of the buildings next door while I was there. At night, as with any city, it felt like the police sirens were non-stop. I'm aware that the management cannot do anything about either of these things, but you should plan to bring some noise-cancelling headphones if you want to get any sleep.