I had a great stay at Helia's apartment. Helia was lovely and checked me in as well as waiting for me to get my car when checking out.
The apartment is located in a quiet courtyard in one of Berlin's many trendy boroughs. It comes fully furnished with everything you need, regardless whether it is a short stay or a number of weeks.
Access to bars and restaurants is easy, with many on the same street and lots more at Boxhagener Park and surrounding streets.
You can reach both U and S trains with a short walk and Alexanderplatz is only a few stops away.