Twenty-nine, working out of De Pijp, and the one to ask when the working half of the trip has an alarm already set for six.

A couple who need the next morning intact are a particular kind of booking, and she is straightforward about which lengths suit it. Ninety minutes at 540 euros begun at nine leaves both of you asleep well before midnight, and she proposes the earlier start herself instead of waiting to be asked. Spanish and English are both hers, though she uses fewer words in either than people expect. The long blocks south of the canal belt are quiet by ten, which helps an evening meant to end in sleep rather than in a second wind. Whatever the hour holds is her decision, said once at the beginning, and it covers the two of you alike.

Caroline decides which bookings she takes and may decline any of them; she sets the limits for what a session includes, says what they are, and may end a visit at any point, as the terms set out.