Regarding the Suite and Globalist upgrade, I've always been upgraded to at least a Regency Suite on each of my stay. The highest upgrade I got was to the Chantilly Suite during Summer 2021. All suites are quite nice and all have a different layout, because they are all located in the "old" buildings, whereas most of the standard rooms are in the modern wing, farther away from the spa and Front Desk.

Also note that the hotel used to set up a Regency Club in the middle of the Lobby before Covid, but I think they stopped this with the pandemic. However I always get either a bottle of red wine or champagne in my room upon arrival.

The hotel often gets busy on Saturday nights but is very quiet other nights. Occupancy has been quite limited since the beginning of the pandemic.

Last thing regarding the spa, last time I went there (a few months ago), you had to book a one hour time slot. They had saved a few time slots automatically for Globalists, but you should maybe email then to check what's the current procedure, especially if you are staying on a Weekend.