Happy to see Lunanode rated Really Good. My exact experience during more than three years as a completely happy customer. They don't stock any Alpine Linux, but fetching the install image and setting up is a breeze, and not once, ever, have I had an issue with any of my instances. And highly appreciated: I can clone an instance, download the qcow2 image, fiddle with it locally, upload, and put it back in production. Flexible, easy, clean, no nonsense, reliable, cheap, and absolutely recommended.
Don't know about support, though, since so far I have had no cause to call them.
chuckled a little when reading the first negative of luna was the absence of having a debian 10 template. i raised a ticket with them about this in july, and have been periodically testing new openstack releases from https://cdimage.debian.org/cdimage/openstack/current-10/ to see if the issue 'fixed itself' for some reason with debian 10, cloud-init takes around 6 min to raise network interfaces, which is why they haven't released a template yet. not sure if the issue is on lunas side or not.