As mentioned above, it's extremly easy to setup this thing and extremly easy to run. Moreover, it's extremly smooth, TeamViewer looks like a laggy stuff compared to this one.
As you can see on the images, you can take absolute control of your/friend's PC and everything goes absolutely smooth and fast.
To setup this thing, you need to download two files,
Setup your PIN code, open your Android app, paste it in there and you're basically there.
If you tick the option to remember the PIN, you can access to your PC absolutely everytime. You don't really need to verify the PIN everytime you want to connect. Cool, isn't it?