This wasn't my first trip to Fukuoka but my first ryokan experience. It was a pleasant stay. The room was nice, the bedding was very comfortable, the building was quiet, and they do have WIFI, which I wasn't expecting as no other review or info I saw mentioned it.
The owners were nice but spoke very little English. I only stayed for a night and didn't try the communal bath, but would have preferred shower stalls in the shared bathroom areas. I also didn't have any meals which leads me to one strange part of the experience: I booked the room on Agoda for approximately 4200 yen (maybe a little cheaper because it was in Korean won) and Agoda said it was some kind of promotion and a large percentage discount. Later, I saw the ryokan website and that was the basic rate, ie not really a discount at all (agoda had a few more expensive options with meals, that could've been the reason, but I'm not sure).
Sunny supermarket is about 10 minutes up the main road at Gofukumachi Station, a great place to grab some cheaper beers and discounted sushi later in the evening if you are looking to stay in. The TV has only a few channels, but with the nice WIFI I wasn't worried about that.
A nice place, new experience, and owners who I think deserve your business!