Totally true about the reception, my bad, I was in a business trip. About the mattress, it doesn´t need any "adaptation period" it´s just a mattress that shapes itself with the heat, it´s actually the best mattress money can buy on the market, you"re casting pearls before swine.
The house doesn´t have strange households it´s a domotic house that is technologically adapt to be controlled easily. Maybe its not a house for old people though, if they are not used to technology.
About the heater, it got broken for pumping pressure deliberately, which should have not been done, but again I was outside of Spain and couldn´t avoid this. The result, a 500€ bill from the plumber and 385€ reimbursment to the guest, so a total of 835€ fee. Luckily it got repaired very fast.
Not going to continue with the rest since is more subjective, but you just have to see the rest of the reviews to get an idea from the house.