Sakura: A Neat Terminal Emulator, Targeting GNU/Linux (C, GTK+, GNU GPL v2)
According to its page, (see Sakura at Launchpad, not Microsoft GitHub) "Sakura is a terminal emulator and it's [sic] only dependencies are GTK and VTE. It uses a notebook to provide several terminals in one window and allows to change configuration options via a contextual menu. No more no less."
I started using it yesterday (recommendation from MinceR) and despite being relatively obscure it seems to work well. It's simple, but not too simple. It contains important features, sans the understated simplicity and sans the bloat. It has full tab support and themes. Unlike Konsole, it does not demand Qt.
Installing it isn't hard; in Debian-based distros (Debian, Ubuntu etc.) run apt-get install sakura or apt install sakura (or other package management command). █