Stayed here twice and had a great time both times. The area is nice and the staff was extremely helpful and keeps the place very clean. Didn't try the in house restaurant, but the dessert/parfait operation they run at nice had some really delicious desserts and drinks.
My only complaint is the hostel's towels are very thin and you're only allowed one for the stay. Additional towels are available for rent for ¥200 for the stay, but if you have a lot of hair (or are very accustomed to more plush towels) you may want to bring your own. I will be doing that next time and would definitely stay here again!