I highly recommend the Winkl Lux Mattress, however, I urge caution with the wooden bed frame.
After a few months of using the mattress, I have found it to be very comfortable with me achieving reliably good sleep.
I stopped using the wooden bed frame after a week and sourced an alternative base to use with the mattress. The wooden bed frame boards are laminated with sharp right-angle corners and rough edges. I gouged my legs on a couple of occasions while getting out of bed.
I actually regret buying the wooden bed frame.