I can only recommend this accommodation and host. Gundula and her husband are very kind and answer quickly if you have any questions or requests. They even put up Christmas Decorations so we could feel more festive. The studio is quite big, the kitchen is very well equipped and it is in a quiet street. Metro or tram stations are close by and Friedrichshain in general is worth visiting. This is the place to go if you wanna visit Berlin!