Just completed a 2 night stay at the PH GZ. The Park Suites do indeed have a sofa but some rooms' will be larger than others. I had a giant L sofa in 5x19 while my friend in 5x11 had a smaller one.

The hotel does not allow guests to take their Diamond breakfast as room service but the staff were able to help me purchase train tickets to Hong Kong (with a small surcharge I think).

Overall, had a great stay and would happily return.