Let's check out the South Lake Union Rococo Coffee location. It is located on the first floor of Amazon's Arizona Building. You don't need to be an employee to enjoy the cafe. There is seating in the atrium around the corner from the cafe.
Parking in this section of Seattle is street-side metered pay parking (I suggest you look for 2-hour parking as the Amazon employees tend to fill up the 10-hour spots). Also, the South Lake Union Trolley has a stop down the hill from the building (Terry Ave. N. and Thomas St.)