Thank you for all your insightful responses. I decided to call the hotel directly without mentioning my existing reservation. As most of you have correctly noted about the FI properties, the one I am staying at does not charge an additional pp room fee. On a side note I do find that interesting, not because of the actual stay in thr room, but in essence, they are giving away free continental breakfast for 4 people for the same price as 2. Of course we are not talking about a gourmet breakfast, but interesting nonetheless.