Not to rain on anyone's parade, because frankly I too had a similar experience (except it was my sister's house instead of a hotel).
But I have to wonder if there is some placebo effect or some other psychological mechanism that might cause us to sleep better in someone else's bed. Maybe because we're on vacation and have less stress?* And I am one who always thinks people blame "stress" for too many things... but I am just looking for an explanation for this phenomenon of sleeping better on hotel beds... (which I also have had in the past).
I mean, come on - a SERTA? They are considered among the WORST of the S Co. mattresses!
Well, what the heck, though. It might be worth a try if it even gives you 6 months of good sleep.... Good luck and keep us posted!
*In my case, there was not a "less stress" factor at all. I was going home to visit my family under unfortunate circumstances, so it was not a "carefree" type vacation. So I have NO explanation as to why I enjoyed my sister's mattress so much.