The black screen after baking using the GPU is most likely caused by insufficient memory of the graphics card. Your scene is rather large - it consists of 10M triangles, and it seems too much for the 2GB of memory your graphics has.
Decreasing the number of triangles in your scene would be beneficial not only for GPU baking, but also for the viewing frame rate and download time.
In order to find out which objects contributes most triangles to the total number of 10M go the the Objects tab and analyze the object list. It is sorted from the most complex ones (at each hierarchy level).
The majority of the triangles come from the pillows’ tassels, please see the attached screenshot. The tassel (object named Group#329) consisting of ~24k triangles exists in 388 instances, which gives over 9M triangles in total. If you managed to replace the tassel model with something simpler it would greatly reduce the scene size and improve viewing performance.