Every Japanese hotel I stayed in provided a set of essentials: a mini-fridge, coffee and tea service, a hot water machine (usually a Zojirushi brand), cups, spoons and an ice bucket. At the Keio Plaza, it took me a few minutes to realize that I needed to telephone "In Room Dining" to get ice. Well, as long as we were having ice, might as well order a cheeseburger and something sweet. The ice came within 2 minutes of my call, the cheeseburger a few minutes longer. Yes, the person who took my order spoke excellent English. With my own Zojirushi machine, I made my own tea and with little effort, I could have made instant noodles, oatmeal or many other things. This is all very handy for the travelers. The mini-fridge, a computerized gizmo, had slots for the various beverages. Remove one and the charge was instantly on your bill.
Even though the buffet breakfast on the second floor restaurant was included in our room charge, I preferred to order room service. The cheerful woman who delivered our order was always a pleasant way to start the day. A full breakfast cost about US$30 and a cheeseburger about US$12. The ice was free. No charge for the coffee and tea service unless you used the French drip coffee, which was about $4. All in all, it was a very pleasant experience and a part of enjoying a really fine hotel.