It's a beautiful Showa Era Ryokan that's over 70 years old. There is a 200 yen accommodation tax when checking in (this tax applies for all accommodations in Fukuoka), which I happily paid for as I want to support sustainable tourism).
You leave your shoes at the main entrance and use slippers throughout the Ryokan. You are provided a toothbrush, yukata, and a prepared tea set that you can pour hot water in immediately to consume.
I believe I met the owner's father, who checked me in. He was incredibly patient, introduced me to my room (which was clean and tidy), set up my bedding, and guided me to where the facilities were while explaining in Japanese with some English translations. The amenities are a little outdated, but in exchange-- the accommodation is affordable and breakfast is an available option. The walls are also a little thin-- so you will hear some noise from the outside, this did not bother me though as the area was quiet during the night. The check-out time is 10AM and I easily did so by leaving my room key in the basket at the main entrance.
In summary, the Yamamoto Ryokan is an affordably wonderful and historic place to spend your nights. They have an instagram: @yamamotoryokan and a cute Shiba Inu dog named; Charmie. I sadly didn't get to meet the dog but heard them barking in the morning.