Have stayed at POR 4 times, it will be tight but, you just sleep there. You may want to bring an inflatable twin mattress to put between the two beds. They use to have a trundle bed you could do that with, but I guess no more. Only hard thing about putting a mattress between the beds is remembering not to step on the person.

This is usually where my DH slept (of his own accord) and the kids would step on his head sometimes. Not to big of a deal except when he was dead asleep.
What helped us in tight quarters, over the door shoe organizer and having our park clothes all packaged up for each child. The first trip at POR I did not do this because I thought it was over the top. However, when I was running around like a chicken with her head cut off looking for underwear and hair elastics I had wished I had done it. Every trip after that I was more organized and I have to say it is an awesome feeling waking up for rope drop and just throwing a plastic bag at each child and then walking away with a satisfied smile to drink my coffee outside.

Now that the kids are older, I do not package their clothes, but do have matching shirts and that simplifies things too. I just take out the pile of shirts for that day and they are on their own. They are now well trained and get the importance of being belly up in front of the crowd at RD
Not sure if this helps, but hope it does. Nurse Mommy of 4 (Tasha) is also a veteran of POR with a large crew so hopefully she will pipe in her tips.
POR is gorgeous! The food court is divine and this web site has a lot of good info:
http://www.portorleans.org/