Six Sleeper Sleeping . . .
Our oldest daughter uses the couch as her bed and she finds it very comfortable. We use an open sleeping bag under the sheets as a pad to soften it up a bit. I've napped there and it is plenty long enough for one adult (I'm 6').
Our younger daughter uses the dinette bed and is quite happy with that space. It is also long enough for a 6-footer. The seat and backrest pads are pretty firm, so we soften this one up with a thick sleeping bag used as mattress pad, too.
My wife and I struggled for a bit with making our bed comfortable. We started with one of those mattress toppers, then added an inch layer of that small egg-crate-style foam from Macy's under that. Eventually we went to a foam store and bought a 4" layer of that special foam that adapts to your body shape, which we put under the other stuff. ALL OF THIS is sitting on top of the factory mattress and we are now very comfortable in our bed. Some long-sided fitted sheets control all of the various layers. It is real soft but also surprisingly supportive.