The location is good, you can roll your heavy luggages from Ueno station to the location without lifting them. Breakfast is simple, if you come early, it is satisfying since the full menu is still available.
They are kind in giving free treats: 3-6 PM, free flow soda and calpis drinks; 6-9 PM, free alcoholic drinks are provided. You can taste a sip of Japanese drinks (suntory whiskey, local plum, wine), as well as other usual drinks.