I use Yakuake terminal. It runs all the time and when you hit F12 and it pops down from the top of the screen. I’ve got it set to be 60% of the screen width and centered horizontally. I don’t have to wonder where the terminal will open or how small it will be.
I've heard of it, but have never used it.
My favorite is Terminator. I have a few layouts set up so I can click on an icon, and it will open a window separated into multiple panes and each pane will automatically log into a cluster node on a couple of different HPCs at work. One click, and I'm logged into about 20 different servers.
Pretty cool.