I booked for KR after reading the reviews of it. And I also wanted to be staying somewhere close to the JR and the city center of Tokyo. Although it's price is slightly higher than a dorm hostel, it's really worth it. Because, you get your own private room! The environment is also very clean and comfortable.
The staff that I met with were all extremely helpful and I really appreciate it, answering my queries and many questions. The toilet area also provides toothbrushes (clean ones of course).
The only downside was that I was staying right infront of the lounge area and it could get a little noisy at times.
But other than that I'd highly recommend KR for anyone who wants a ryokan experience in Japan!