I'm for making it easy. Don't have any need for sheets and blankets....just more stuff to deal with.
We have a color coordinated cover for the mattress. Fits over the mattress and zips up. Looks very nice and we have pillow covers that match it. Then we have a summer side/winter side sleeping bag with sheets that velcro inside. The sleeping bag color matches the decor inside the motorhome. Very neat and tidy. Easy to make the corner bed. Just zip up and spread out. Toss pillows on top and you are done.
We started using this approach when we had a shorter motorhome with only a bed over the cab. The cab over is much more difficult to deal with, the corner bed is a nice improvement. A walk around bed would be very nice as would the additional room but a smaller motorhome fits our travel style much better.
Just our solution...I'm sure there are many different options for dealing with the corner bed ;-).