So not sure if I can answer your ultimate question about the sofa beds but can on the inside room. We have only sailed on the Edge, as 2 people, in an inside room and it was the one attached to the sky suite. The only downside to the room was that open floor space was at a minimum due to the king bed. That said it was the most well thought out and comfortable inside room we have ever had. Even the bathroom was great with a large by cruise ship standards shower. I also believe our state room host was a notch above, likely the same one assigned to the sky suite. They even knew enough to put a little water in the dry trap in the bathroom to keep it smelling fresh, small thing till you have a room that wasn't done. Also the storage was insane and we likely only filled 20% of it.
We like the room so much that we booked it for the PC touch 12 night cruise on the Edge and will not look into any move up offers. Might be our favorite room we have ever stayed in, even better than the larger veranda cabins on DCL.