Berlin at night.

Just to manage expectations: Berlin is in a very difficult situation with its financial household, Therefore the city tries to save money at every cost item. Therefore Berlin at night is less fascinating compared to 10 or 20 years ago they reduced lighting of official buildings remarkably. Background article in German language about that topic and another article about the light status as of start 2023.

A better time to visit Berlin for this purpose is beginning of October for annual Festival of Lights.

And to answer your question from a photographer view: yes, can be worth at days with clear sky because pre-sunset light can also end in very interesting moments with city lights or shadows. Berlin has also golden and blue hour after sunset.

in a very difficult situation with its financial household

I can still hear what Berlin's former governing mayor 'Klaus Wowereit' once said: "Berlin is poor, but sexy."

I'm probably about to read now 'Munich is rich, but not sexy' - that's okay, because Munich doesn't want to be sexy :-)

But I can highly recommend the Festival of Lights to everyone.

I attended the Festival of Lights pre-COVID on the recommendation of MarkK. It was great.

Here's an idea for April, if tickets are available. Visit the dome of the Bundestag at a time that is something like 45-60 minutes before sunset. Walk the dome with the audio guide and see Berlin by sunlight, and then hand around on the roof until after dark. I have done this a couple of times. It's cool to watch the city move from light to twilight to dark from that vantage point.

Another vote for visiting the dome at sunset.

When I got to Berlin on my first trip in July of 1971 amid a heat wave which floored me, totally unprepared for that, I thought this must be the famous Berliner Luft. I saw on the postcards and heard from the youth, " Berlin ist dufte "....how true.