I had a wonderful stay at Karoline's place. It's a well-kept apartment that makes you feel right at home and has everything you need. The neighbourhood is nice and has lots of places for lunch or to get coffee. You're also close to a tram station giving you easy access to the rest of the city.
Please note: the apartment is situated on the fifth floor and is only accessible by stairs, so be aware if you're travelling with heavy luggage.
If you're planning on travelling to Berlin for a couple of weeks or longer, Karoline's apartment is the perfect place to stay.