If you want to know whether these items are allowed in your room, you should ask the hotel where you are staying. Some rooms in which kitchenettes are installed have the proper wiring, etc to meet fire code safety rules for the additional electrical loads these appliances would add to the circuit. Appliances that heat stuff up--require a lot of power--this would be anything like a grill, toaster, waffle iron, coffee maker, hot plate, et'c. If you are ever curious what kind of load your appliance is drawing from the circuit, it will tell you somewhere on your appliance--(sometimes the value is expressed in watts, sometimes in
Amps...Amps = Watts / 120 Volts). To give you an idea of the relative load on the circuit, bathroom and kitchen circuits are usually 20amp circuits--whereas other household circuits are often only 15 amps. Some of the above mentioned appliances draw over 15 Amps by themselves--so, you can see, you really need several circuits for a normal kitchen ( this depends on kitchen size).
Generally regular hotel rooms are not wired for the type of electrical load required to run a kitchen in addition to everything else in the room (your blow dryer, curling iron et'ct).. Because of this, if the rooms are not designed to handle the load, hotel management is not supposed to permit cooking in the rooms. This probably won't change anybody's mind about taking these appliances along, but I think you should know that they are against the rules for some very good reasons.
Of course, there are some other more obvious reasons for not cooking in a room that is not set up for it, too:
For example, residual cooking odors--a lot of rooms are non-smoking rooms. How about a non-smoking room with residual cooking smells? There is no vent provided for venting the cooking fumes when you cook in a room. In your home, you probably have a fire alarm that is at least one room away from your kitchen. What happens if you accidentally set off the fire alarm in your hotel when cooking?
Another logistical problem is with washing the pan out--there is no kitchen sink or garbage disposal in your room. It makes it a big challenge to clean out your appliance. (Although, I believe the G.F. probably does have minimal clean-up. How about the clean up from making fried chicken, or fried fish or spaghetti or eggs in an electric frying pan ). And what do you do with the grease, if there is any?
Bottom line is if you want to know whether it is permitted, you should ask before using one of these devices in your room. If they say, "Yes"--you're golden!
-DC