
You're cute! I can tell that this is your first Apple product, and that you never had to deal with Apple support before.
Let me paint you a picture how that "free repair" is going to play out. There are basically two possible scenarios depending on whether your laptop is still in Apple's 1-year warranty or not.
Scenario 1: you're still in warranty.
They will take a look at it. The so-called genius is going to be shocked and surprised, and he/she is going to swear to God/Buddha/Allah/Spongebob that this has
never happened before, and that yours is the
first and more importantly
only keyboard that has ever failed. He/she might even call a colleague to act similarly surprised and shocked trying to reinforce that lie. Then, they will offer to take it in and replace it for you since they're such a good company and sooooo concerned with their customers. A week or two later they will return the laptop to you. You walk out a happy cookie with a smile on your face.
Scenario 2: you're out of warranty
They will take a look at it. The so-called genius is going to be shocked and surprised, and he/she is going to swear to God/Buddha/Allah/Spongebob that this has
never happened before, and that yours is the
first and more importantly
only keyboard that has ever failed. He/she might even call a colleague to act similarly surprised and shocked trying to reinforce that lie. Then, they will you that unfortunately you're out of warranty and there's nothing they can do to help you. You should have purchased their extended warranty AppleCare (or AppleCare+, depending on country) and will then offer to replace the entire top case including the battery and touchpad, because those are all one single part held together by roughly a metric ton of superglue, for a nice $500.
How do I know all this? Because I've been through this. Three times in eight months.
Seriously, hoping that Apple will do anything "for free" only proves that you have no experience with Apple customer care. Even the fact that you live in Europe doesn't really help either, because Europeans also only get a single year of warranty. The laws state that you get two years of defects liability with automatic reversal of evidence after six months, and Apple has been known to refuse to even look at a defective device for free once it's out of warranty. They've even been instructed to dial back their repairs a Apple's expense in order to push and promote their expensive AppleCare products.
Either way, good luck. I really hope you'll be one of the few who won't suffer from a defective keyboard.