I stayed for 8 nights at BBET, and it was fantastic!
Ted helped me for small things like handling online shop order even before i arrived at the property.
We were allowed to add new members in the middle of our stay with extra charge, paid in cash.
If you come and go from Tokyo area, it's just a less than 1 minute walk from nearest bus station; i recommend to go from tabata station by bus.
All bedrooms and common room have air conditioner, so it's a good place if you want to escape summer heat. There's hot water in the bathroom; just a little bit hard to control.
Overall, i would definitely recommend anyone to stay at BBET, especially if you come as a group of 7 or more.