This is more like an apartment than hotel. They don't clean the room everyday. Lots of young people, possibly Amazon employee, living here. Check out the hotel website for the amenity map, they are all available and very nice.
Hotel layout is kind of complex, with multiple elevators to different places, so it takes maybe a days or two to figure out how to most efficiently go everywhere. Elevator are operated differently from typical ones in hotels, so it can be confusing at the first few rides, but once figure out how it works, you would actually feel it is very efficient and much better. Elevators are very fast. Only need 1 elevator ride from any garage floor to room floor.
Garage has plenty of spots. Just need to go down 4 to 7 floors. You can always find a few empty spots together where you can comfortably park larger vehicle. Knowing the crazy surface parking situation at hotel location, it is really nice to have a guaranteed parking spot. Make good use of the P1 level.
Don't worry about the "pre checkin" link sent to expedia. It is not needed.