Lewitt Connect 2

It is exactly what I was looking for. A small, elegant audio interface for a single microphone.

Some Linux Troubles:
I was initially disconcerted by the fact that the software seemed to be a tough requirement but that's not really the case. I spend most of my time on Linux where the software is not available. Fortunately the settings are stored on the device itself. Thus you can just configure it on Windows or even in a VM and then use it on Linux just fine.

General Usage:
The Connect 2 reacts to inputs instantly and even without the software everything is pretty intuitive. I can't talk too much about the sound quality as I lack comparisons but from what I can tell it's pretty clear and undistorted.

Fun fact: The developers of the Lewitt software seemingly reused everything from the Connect 6 - they didn't even bother to rename the configuration directory on Windows.