The current requirements says it will take up 70 gb on HDD. I'm a bit worried since they recommend a SSD right after. There's no benchmark tool, and consoles like PS4 and Xone doesn't have SSD on their own. My pc is inside the requiremnets for the game but I don't have a ssd with more than 70 gb. Will I be able to at least play it, if I install in my HDD ?

Of course.
The SSD recommendation is really just relevant for impatient people, who want their games to load up as fast as possible.

I sure hope so, I have a ps4 but it's the regular model with the original hd so, I rather play cyberpunk on my PC. Anyway, thanks for the reply!

You might get longer loading times, framerate drops when walking between different areas (in and out of a building, etc.) and/or travelling fast in a vehicle. Might be somewhat better if you have more than the minimum RAM. But yeah, the game will work.

My current specs are
AMD Ryzen 5 2600
24GB RAM (Dual Channel)
GPU: GTX 1060 6gb
SSD: 120GB HDD: 2TB

I worry because my SSD holds the OS, so it's almost full. I have no problem with possible loading screens, I just want to play it.

Don't worry, it'll work. And it's not competitive multiplayer where loading problems could put you at a disadvantage. At most it'd just be an annoyance.

With that in mind, SSD performance can decrease a lot once it fills up because empty space is needed for caching. It depends on the model but ideally, for optimum performance you'd want to keep something like 50% free space for smaller SSDs (up to 0.5TB) or ~25% for larger. So in the long-run I'd think of upgrading.

But for now it should be totally fine for playing CP2077.

Thanks, I think I'll conclude my preorder now.