Any German peas? Or those familiar with Berlin?

I love Berlin! We spent a week there about 2 years ago, and I have wanted to go back ever since.

We did the Hop-on, Hop-off Bus the day we arrived. We didn't do any 'hopping', but used it to orient ourselves in the city, and to decide on places we might want to come back to. We also did a guided walking tour the next day which I would highly recommend. Again - really good for orientation and for an overview of the city's history.

Berlin can be rather draining to visit, given the history. We found we needed downtime after some museums/locations, just due to the emotions they brought up. I would definitely recommend the Bernauerstrasse Wall Memorial and the Jewish Museum. Topography of Terror documentation centre - on the site of the old SS headquarters was also good, if harrowing.
The Museums on Museum Island are also excellent - my favourite was the Pergamon, but the Neues Museum and the Alte Pinakotek were also good.
We didn't manage it on our trip, but my son and DiL went to Potsdam, to the old royal residence and loved it. This is one I would pre-book if you want to go, especially as you will be there during summer break.

Scrapbooking is not really big in Germany, and most of what you can buy is American anyway. I don't know if there are any specific scrapstores in Berlin. There are a number of nice yarn stores, if you knit or crochet.

Can't think of much else right now. Have a great trip!

I loved Berlin. I used to live in Munich but went to Berlin often.

To be honest though- we spent most of our time clubbing and out and about. Berlin loves to party so it was the best place to go on the weekend.

In just two days, I would do a bus tour and maybe a bike or walking tour near the older parts of the city. Definitely the Wall and maybe the Holocaust museum- like the pp said, many of the touristy things there are heavy. Pick one or two and don't go overboard. It is too emotionally draining to pack too many in.

I haven't been back in 9 years probably, so I can't help with the craft stores and scrapping. They were never a thing there, even when I lived there so I think it unlikely you will find many.

There are lots of great squares (platz) to grab food and hang out and people watch. I would often go to Gendarmenmarkt or Pariser Platz. They are flanked by awesome architecture and just a good way to get a flair for the city.

You're going to be there a week, right? Not just two days?

We went for a week this past Christmas. As mentioned, tourism heavily emphasizes WWII, the Holocaust, and the Cold War.

WAR and WALL: 
-We thought Checkpoint Charlie was tacky. 
-Berlin Unterwelten has cool tours of underground Berlin. We did two tours - one focused on WWII bomb shelters and one on escapes under the Berlin Wall. 
-Berlin Alltag in der DDR is a nice small museum that focuses on what life was like in the DDR. It's set in the Kulturbrauerei, which is nice arts and entertainment center. 
-Tranenpalast/Palace of Tears is a small museum set in the train station checkpoint between East and West Berlin. We all preferred it to the Berlin Wall Memorial. (Nothing wrong with that one, though.) 
-Topography of Terror is very grim and involves a LOT of reading. 
-Walk along the East Side Gallery to see a long remnant of the Berlin Wall that is covered in art.

OTHER:
-The Jewish Museum was EXCELLENT - really innovative exhibit set-up. I wish we had allowed more time.
-For a completely different vibe, there are beautiful palaces and gardens in nearby Potsdam. 
-We really enjoyed visiting the Reichstag dome and attending the 45 minute lecture in the visitors gallery of the Budestag (German legislature). Register ahead of time. There's also a restaurant in the dome.
-To go full-on tourist, have a revolving lunch or dinner at the top of the TV Tower. 
-Kreuzberg is a hip, gritty neighborhood. 

The public transit system is excellent. There are probably sightseeing boat trips on the river during the nice weather months. 

And no, I didn't answer your question at all!