Is anyone familiar with TeamViewer? Would it be a good choice to use for remote access when my mom in the US calls and says "I can't figure out what I did to my computer..."?

I tried at one point to install VNC but wasn't able to get it working. I'm unfamiliar with configuring ports, etc., and didn't have time to figure it out while I was there.

Just looking for something simple on both our ends which is easy to use and reasonably secure. Your feedback is most welcome!