Schiphol rooms, arranged apart from the city
Schiphol by arrangement means an airport or airport hotel room is booked on its own terms, with the journey time agreed first and half the fee paid ahead.
Some visitors end their trip at a hotel beside the airport, to be close to an early flight. Those rooms are outside the central Amsterdam area, and a booking there works differently from an evening in the city.
The journey is agreed first
The forty to sixty minute window does not apply at Schiphol. Instead, the time her journey out there will take is worked out and agreed with you in the thread before anything is fixed. Only when you have accepted it is the booking confirmed.
Half ahead, always
Every Schiphol or airport hotel booking carries a deposit of half the fee, even for a returning guest and even on the same day. Each length costs out there exactly what it costs in the city, with nothing added for the airport.
What the airport message should say
The hotel's address, your room number and floor, how guests reach the rooms from the lobby, and the time of your flight the next morning, so the booking can be planned to leave enough sleep. Airport hotels often have keycard lifts, and a note about that saves time on arrival.
Nowhere else outside the city
The house serves Amsterdam and Schiphol only. The outcall entry explains how far the arrangement reaches.
A room near the runways also suits a visitor who spent the final day walking in the centre and would rather not travel back into town once the case is packed. Say what time you need to leave the hotel for the flight, so the length of the booking can be read against the morning.