Single vs Double Room = Breakfast
My experience is that most hotel where breakfast is included will charge you extra if you bring your guest for breakfast if you book single room.
If you book a double room in advance the breakfast is included.
In Manila Hotel they add usd.10 for double room.
In Sofitel, if you stay at a club room, you automatically have breakfast for two persons.
In Hyatt (Malate) they never charged me any additional for bringing a guest to the breakfast room. This was also a club room/business class room.