Did exactly this last year, was great.
Some random tips:
o Work out how to get from the airport before you go. The trains were baffling and under-signed on the way in, tho we made it.
o We stayed in the hotel eurostars by Freidrichstrasse, perfect location for walking or u/s-bahn to everything we wanted to see. Easy to walk to food in the evening etc.
o We liked seeing all the museums, got a 3 day museum pass which was good. Could advise on which ones if you like the sound of this.
o Was really hot that time last year, glad of air con in the hotel.
o Schwarzwaldstuben, burgermeister, madami, for three of the restaurants we went to that stood out. Burgermeister is more of a byob converted public toilet mind…
o Book the reichstag in advance, and book for after sunset, going up the dome at night is great. It’s also cooler if it’s sunny!