For this we need to ad EPEL repo, add it as follows:
sudo yum install epel-release
yum install -y x2goserver-xsession
yum groupinstall -y "Xfce"
Edit - 2019 - I have recently found out KDE Plasma Workspaces also works with x2go!
Installing KDE on Centos 7:
yum groupinstall -y "KDE Plasma Workspaces"
Note: As much as I prefer the gnome-desktop or cinnamon-desktop environments, I could not make it work. If you find a way to make it work please feel free to leave a comment. Xfce is fine for basic remote desktop access. (and KDE is even better!)
If you need to open SSH
firewall-cmd --permanent --zone=public --add-service=ssh firewall-cmd --reload
To install x2go client on fedora
sudo yum install epel-release x2go-client