Not sure what hardware is included in those prices but is indeed extremely cheap. I've used hetzner for many years until I moved all my stuff on AWS. I think their "server auction" page is especially interesting if you're looking for something on the cheap:
https://www.hetzner.com/sb
I understand why kimisufi might be tempting but I'd rather pay a bit more for decent hardware (eg 2xhdd/ssd) and proper support but it depends on what you're doing with the server and what are your requirements. However, for something similar to kimisufi, there's online.net, scaleway.com and aruba.it but I haven't used any of them, just heard about them so YMMV.