Just stayed there this week. Overall the stay was good. Was upgraded to a "junior suite" although technically it's a full suite with a separate living room.
For Platinum, there is a choice of continental breakfast or points. And you can choose a $10 credit or points for amenity. I think you get two choices because it's an autograph hotel without lounge.
The restaurant menu actually looked good and I might've tried it if I had more time in Granada, but I found an incredible local restaurant instead...
The breakfast selection is decent. You can also pay for hot items, which were ~ 5-8 EUR. I noticed that there were two menus, one labeled for Platinum. Only the menu for Platinum had the prices listed, so I wonder if the regular buffet included the hot items and they were only offering continental breakfast for Platinum?