I absolutely loved this show, I watched it in one night, and I have basically recommended it to everyone that I know. I think that it's important to note that you don't need to have watched Charité in order to watch Charité at War as they take place at different times and have no shared characters (that I was aware of). One of my favourite things about this series was that it showed so many different perspectives of the situation, with some being in strong agreement with Hitler's regime, others working against Germany, and others in-between, all from within one setting. I also loved that it looked at some of the other impacts that the Nazis had on the German population, besides Jews which, in my experience are not portrayed as frequently in media. I also found the story line incredibly gripping and believable, which nothing feeling forced, unnecessary or 'far fetched'.
Highly Recommend!