What a single operator does well
The person quoting is the person cleaning, which removes an entire layer of misunderstanding. They learn the unit quickly, notice changes, and can usually be reached directly. Overheads are lower, so for a small requirement the price often is too. For a straightforward premises with predictable hours and no unusual compliance requirements, this arrangement can be the most efficient thing available and the least complicated arrangement to manage from your side.
The limits are structural rather than personal. One person cannot cover their own absence, so illness or holidays create a gap unless they have arranged something. Equipment is limited to what fits in a vehicle, which matters if your floor needs machinery. And there is nobody supervising the work except you, which is fine while things go well and awkward when they do not, and the absence of independent oversight becomes obvious at exactly that point.
