The bedroom was authentic. You sleep on the a thin madress on the floor. It wasn't that bad, but I wouldn't be able to sleep on it for more than a week.
Guest network didn't really work, but they had a portable WiFi that we used instead.
Common room, kitchen, bath and toilet is shared with the host. These rooms was messy and not perfectly clean, but still okay. The rented bedroom was perfectly clean, though.
Location is not that far from the city and easily accesible by train. The nearby station is undergoing construction at the moment so you're forced to change train, but not a problem at all. Closest station is a 5 min walk from location.
Restaurants and supermarket is very close.
Lina is so sweet and wanted to talk to us and gave us some local tips and tought us some Japanese words. Be sure to talk to her!
All in all a good experience :)