Thought I would update on my experience with a Guarantee room for 3 people...
To summarize, in late March for Harmony, June 23 we booked a Neighborhood Guarantee. In late April / early May, we were assigned to a Boardwalk Balcony (category 4I). A couple weeks after receiving the assignment, I went to check if we received a room with a pullman or a sofa bed. Much to my surprise, our room did not indicate either. After hours of phone calls between C&A, Resolutions, and the Executive office (after emailing the CEO because of the lack of confirmation to the accommodations), we were moved to a Central Park Balcony (without our knowledge or agreement with the move, even though just hours earlier Resolutions advised we would be contacted before any room changes were made). The deck plans still showed no pullman or sofa bed for the Central Park room. We were assured furniture changes were being made and that by our sailing this room would have a sofa bed. Told the ship would take pictures on turnover day to show the sofa bed in that exact room. Never received any pictures. Nothing more than verbal surety was ever provided. In all of this I also learned that RCI does consider a rollaway as the 3rd berth for a 3rd guest... Lesson learned. A rollaway in a balcony room would leave no room to move past the only space it could go - between the couch and vanity.
We kept watching rates and availability to try to move to a room we knew, per the deck plans, would accommodate 3 people. When the price of a suite guarantee dropped substantially, we decided to change to that. Rollaway or not, in a Junior Suite, my concern about space is negated. We had to pay quite a bit to upgrade, but for the peace of mind felt it was worth it.
We are now 9 days out and awaiting a room assignment. After all of the confusion, I have this gut feeling that something will go wrong when we get to the port if we still have no room assigned. RCI is telling me we should have a room assigned at least 2 days before the sail date, but I know there are reports on here that occasionally a room is not assigned before the day of the cruise.
On another note, while trying to sort out the room and bed arrangements, I was accessing deck plans via the UK site, since they would not show anything but deck 3 on the US site (RCI acknowledged this was a known web site issue...) I recently checked the US site, and the deck plans now work as they should.
The deck plans display June 16 onward, and now show the Boardwalk room we were assigned as having a sofa bed. The Central Park room we were moved to does not show any provisions for a 3rd person.
While I get that RCI may update and change bed configurations from time to time, the changes made for Harmony (and it sounds like other Oasis class ships, at a minimum), were ill conceived. The changes should have been planned, rooms identified, and deck plans updated before assigning 3 or more guests to rooms that only show for 2 people. We have booked guarantees for 2 people many times and had no problems. I will never book one again for 3 people, unless it's a suite guarantee.