My LH incoming flight arrives at around 9 am and I shall be leaving FRA the same day at 10:30 pm to EZE!
Since I do not want to hang around the First Class Lounge all day

, I´d like to use the Kempinski-FC-arrival service and a day room at a Kempinski near the airport.
My question to the experienced FRA-flyers:
Whom shall I contact to reserve a LH-FC-paid room at the Kempinski? Kempinski or Sen-Hotline? Which Kempinski are they referring to? Gravenbruch or Königstein? How can I arrange for a pick up with the arrival service?