Thanks for the answer. Bought from a dealer on Ebay. Unfortunately the model is without display (so you can't see the statistics if the KVA has been used before). The machine is wrapped in foil and looks new on the outside. So if the KVA is a return and newly packaged, then it was made by De'Longhi itself.
"Normally the machines are set at the factory" ... that's the amazing thing: set "very coarse" at the factory and the result still tastes so bitter?
But since the crema is also not "thick" enough for a new KVA, I can only draw the following conclusion:
My strong suspicion: It was determined at the factory that this KVA boils much too hot (too hot even at the lowest temperature setting, puck dry and crema too thin, coffee bitter), so that the coffee does not taste much too bitter (and too clearly burnt), the grind was then set to almost the coarsest level (namely 6.5). Whether the KVA is new or returned doesn't matter, it's clear to me that this KVA isn't working properly: at the lowest temperature it should be warm rather than hot.
"You can reset the grind"
I changed the grind to 5.5? (factory setting was "coarse" 6.5)
Coffee tastes even more bitter now (at medium level 5.5)!
I'll wait another 2-3 days. Maybe with time (or more brews) the result will improve. If not, the KVA will be sent back. It's a pity this constant hassle with vending machines. When the "inspectors" discover an error, they try to cover it up by making adjustments instead of correcting the error.
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