After mehrjäriger use of only notebooks I looked around for a monitor and am finally at Acer G226HQLHbid (21.5 inches) has shared. This quantity has proved for me as an ideal, not too big to keep track to lose when working on the PC, but large enough to present multimedia content also excellent. Simple modern design combined with ease of use. Just plug, works without any problems and is also energy efficient. The matte display prevents annoying reflections. The quality of representation compared to other monitors I can not judge, however, are clearly worlds between this monitor and the notebook monitors that I have mainly used in recent years.
Conclusion: good overall monitor, exactly what I was looking for.