Look at the newness of the mattress. Mum slept ok on it, although she was rather tired. It has super springs and memory foam. Can she say that she bought her last bed in 1996 so it was in need of replacing.
I had no problem with it. I just climbed up and went to sleeps. Mum is exhausted but is into day 5 of 7 so is almost there. 3 more afternoon shifts and then 3 days off to relax. So there will be plenty more sleeping to be done.