We travelled from Heathrow to Schipol then onwards to Quito. The staff on board were always smiling and chatty. I paid extra for leg room.
The email sent out saying that a PCR test was needed to board the plane on the return journey was confusing and incorrect. I nearly paid 220 dollars for tests I didnt need. Not everyone has a smartphone with good WiFi abroad so all details should be sent prior to departure and only sent again if changes are made in the meantime.
I would use KLM again though as the journey was good.