We ended up going with Hôtel de Crillon for a 5 night stay next month, booked the suite retreat package - can confirm the guaranteed upgrade worked, we booked Deluxe Suite and have received confirmed upgrade to Premier Suite.
- Breakfast for two
- Guaranteed upgrade
- Early check-in guaranteed at time of booking
- Complimentary round trip transfers
- 2 cocktails at bar Les Ambassadeurs
- €85 credit for use at Sense, A Rosewood Spa or any of the restaurants