Any kind of nook will work as long it has a stud or surface that will support the weight of the microwave.
Measure the space and see if you can find some other cabinetry that would fit in there. Maybe drawers or another specialty cabinet? A carpenter can create what you would need and should be able to closely (if not exactly) match the cabinetry style and color.
The best type of microwave for a small kitchen would be one of the more compact models on the market that doesn't require much space or footprint. These are available from a variety of manufacturers and in a variety of styles.
Generally, no. It would require special permits.
a microwave.
That would require a special license to operate legally.
Krypton is a noble gas, and as such is not reactive. Apart from keeping it isolated for whatever purposes you have for it, I doubt that it would require anything special.
The microwave will explode and catch fire
You would need a VERY large microwave oven to do so.
No, but, they can act as stand ins for your Confirmation.
No, when it is not in use, the microwave would not have a light on. Why would you want the light on when you are not using it and waste energy?
Yes but that would make the microwave unfit to cook kosher food in, so one should not. Then again, if this is a kosher house, pork would not be there.
nothing would happen the microwave does not know if there is anything in there or not.