You are asked to reserve the room by yourself.
You can find B&B hotels around Wako-shi station, which is the closest to the RIKEN.
- Toyoko-inn Wako https://www.toyoko-inn.com/index.php/eng/search/detail/00090.html
- Super hotel Wako http://www.superhoteljapan.com/en/s-hotels/wako/
