There's nothing more revigorating during the dark winter days than spending a couple of hours in a sauna. Germans have mastered the art of sauna and you can find amazing pieces of architecture in the public swimming pools (Stadtbad). I find Stadtbad Neukölln very peculiar in its neoclassic architecture and it's definitely a wallet-friendly option to enjoy some sauna time there. Be prepared to be naked in front of man and woman!

Historical district with buildings designed by Alvar Aalto, Walter Gropius, Oscar Niemeyer and many more.

It is a fine dessert dining. Unique full-on experience with dessert (no industrial sugar is used) course menu and pairing drinks. No wonder they have got a Michelin star!

Zola is a Neapolitan style pizza joint hidden inside a Kreuzberg backyard. This is a killer pizza place, one of the best in Berlin without a doubt. 

It is an English language bookstore centering on non-western, diasporic, and queer perspectives. Many many many rare and special books carefully selected by Siddhartha Lokanandi that is the soul of this place! Check it, it is unforgettable :)