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You can invent any number of nonstandard units, but none of them is "best". It is best to use standard units, that is, the meter.
The standard unit of length is the meter, and any multiple and submultiple such as kilometer and millimeter. Nonstandard units include foot, inch, mile, light-year, parsec, astronomical unit.
That depends what you want to measure about the room: for example its temperature, its color, etc.
Because other people may have no idea how big the non-standard unit is. If I said than my monitor was six fingers tall, how big is that? It is, of course, better to use an international standard unit such as the centimetre or metre, but some countries are still stuck with inches.
No. A centimeter is a measure of length. Any unit of measure that has a meter in it is a measure of length. For example, millimeters, meters, kilometers are all units of measure for length.