@killua072  A mechanical hard drive (HDD) is slow compared to a hybrid drive (SSHD), which is still slower than a solid state drive (SSD).  By "slow," I mean that data will be read from and written to the drive more slowly, as in, it will take longer to install content, or to access it.  But this doesn't make a difference to Sims 4—aside from the initial loading time, the game runs the same on a slow HDD as on an SSD.
I was saying that if you had a choice, a larger SSD would be more convenient, since you could put other programs on it that would be noticeably faster.  But those programs will run okay on an HDD as well.  And if you're only interested in playing Sims 4, browsing the web, playing your music and movies, etc., your experience will be the same either way, aside from the longer time it takes to transfer the data to the HDD in the first place.  Since Windows itself will be on the small SSD, you'll still get some benefits.
I checked about ten different Italian sites last night, and I couldn't find any computer with an Nvidia 1660 ti for under €1500, aside from the one at eprice.  That's not surprising though, since it's so new.  And while it's better than the 1060, Sims 4 won't be able to use that extra power.  With a 1060 (6 GB variant), you should always be able to run the game on ultra settings.
I couldn't find any other laptop with a 1060 6 GB for as low as €1300 either, which is the price of the Asus on Amazon I linked earlier.  It's probably as good a price as you're going to see, unless you wait a while and get lucky with a sale.  Asus makes great gaming laptops, and this particular model will handle Sims 4 very nicely.  Plus, if you do ever decide you want a faster secondary hard drive, it's easy to swap the HDD out for an SSD.  (I checked the manual.)  But you may decide it's not even necessary.
P.S.  It looks like the unieuro model is available again, just at a much higher price now.  But sales can end quickly, especially with a good model like that one.