Hi there
We just got back yesterday and spent one night at RPR while we were there (for the end of our first week), although we had a condo for the whole 2 weeks. We were able to just pack an overnight bag for the RPR. We felt that it made the holiday seem longer. When we have toured around in the UK staying at various places overnight, it has made the holiday seem to last longer. Hopefully it will be the same for you.
To be honest, the RPR rate we had to pay was very expensive - $239 for one night plus tax etc - and we only booked it so we could get the front of line access at US & IOA. We didn't really make full use of the hotel facilities.
I would suggest you register to be a Loews First member if you haven't already done so. You get priority check-in, a room upgrade if available and selection of wine/beer/milk etc in your room on arrival.
Julie