Lets start a (hopefully not too painful!) #Guix adventure thread!
I downloaded the latest VM image (1.4.0), started up QEMU like this:
qemu-system-x86_64
-nic user,model=virtio-net-pci,hostfwd=tcp::10022-:22
--enable-kvm
-m 2048
-device virtio-blk,drive=guix -drive if=none,file=guix-system-vm-image-1.4.0.x86_64-linux.qcow2,id=guix
Boots up fine, gets an IP, nice. But there's no SSH running, so I can't log in. Lets try adding one!