We have pre-installed the noMachine server application in our Kali Linux template. This provides easy Remote Desktop access to your Kali Linux instance.
noMachine listens on port 4000 and this port is open by default in our kali machines. If you configure the iptables firewall in Kali Linux will will need to ensure you open port 4000 so you can still access with noMachine. If you ever lose access there is the option to use noVNC however this is not for everyday use and performance will be less when using noVNC.
Connecting and information on using the noMachine client can be found here