Karolina, 27, discreet company from the Jordaan

The occasion Karolina suits best is the one with an audience. A dinner where colleagues are present, a concert with an interval, a hotel restaurant where half the room is in the same industry as you. She is poised without being stiff, discreet by instinct rather than instruction, and she has never once had to be told to leave a subject alone. Nobody at the table will be able to say afterwards what, exactly, was arranged.

Her record: 27 years old, 174 centimetres, slim, long straight black hair, brown eyes, conversation in English. Sleek minimalist glamour is what she calls the way she dresses, and the four studio frames match that description, black, clean-lined and unfussy. She dresses for the room rather than for the photograph, which is the useful distinction.

Piano is the discipline she has kept since childhood, still practised, still criticised by nobody more harshly than herself, and Margo is the other one here who reads music. Opera is the enthusiasm that surprises people. She will not push it, but ask her about a production and the wit arrives, dry and very fast. Architecture walks fill her free mornings, which is how she knows which streets in the Jordaan are worth the detour and which are just pretty.

For the guest, the practical points are these. She lives a short ride from the canal ring hotels and a clear half hour from the airport, she confirms an exact arrival time rather than a vague one, and she is entirely unremarkable in a lobby in the best sense of the word. Company from €180 per hour, with concert evenings, dinners and longer arrangements quoted on the rates page and agreed before anything begins.