Had lots of fun when I went to see Hertha earlier this year. Was very warm 
Berlin have recently banned Airbnbs, so… get a hotel. I’d recommend Casa Camper which is in Mitte.
Treptower Park, Tempelhof (rent bikes for these if it isn’t absolutely freezing), Jewish Museum, Holocaust Memorial, obvs just walk by the East Side Gallery. If you’ve not done the Topography of Terror or the Stasi Museum then they’re worth a look maybe (don’t bother with the DDR one, shite).
Coffee: Chapter One and The Barn.
Drinking: everyone goes to Neukoln these days.
It will be fucking freezing in Berlin in February so wrap up warm.