Virtual machine under Linux with virt-manager no SSH?

With a virtual machine under Arch Linux I don't get an SSH connection from my laptop to the host where it is running, but it has already got an IP and the virtual network is set to NAT. Can someone tell me what's going on when I first log into the host via SSH and then log into the virtual machine via the host's SSH console, it works

For me, the host is a Linux Mint and the guest is in Virtualbox.

I have set the guest system's network to "network bridge".

In the guest system I then assigned a fixed IP (in the same range of the home network or the host system).

/ etc / network / interfaces