~/.zshrcOpen file ~/.zshrc in your favorite editor (or create it when missing) and insert this snippet:
phoebe_username='your username'
alias mount_phoebe="mkdir -p ~/phoebe_mount && sshfs -o reconnect,ServerAliveInterval=2,ServerAliveCountMax=3 phoebe.fzu.cz:/home/${phoebe_username} ~/phoebe_mount"
alias umount_koios='umount ~/phoebe_mount'
To make sure that ~/.zshrc is loaded in new shell instance, edit .zprofile and insert:
[[ -s ~/.zshrc ]] && source ~/.zshrc
If the process executed successfully, entering the command alias mount_phoebe in your shell ought to seamlessly mount your home directory to ~/phoebe_mount within your local home directory.