The stair decides more than the floor does
A mezzanine is a floor with a bottleneck. Everything that goes up it is carried, including cleaning equipment, water and waste. A machine that would suit the surface perfectly is irrelevant if two people cannot get it up a steep stair safely, and attempting it is how people and equipment get damaged. So the walkthrough measures the stair width, the turn at the landing and the headroom, and the method follows from that rather than from the floor type.
The consequence is usually a manual scope with a realistic time allowance. That is not a lesser service, it is an accurate one. What matters is that the proposal says it plainly, so nobody expects a machine finish on a surface that will be receiving a mop. Where the mezzanine is large enough to justify it, a small unit kept permanently upstairs is sometimes the sensible answer, and that is a conversation worth having at the quote stage.
