We really enjoyed our 12 day stay at Sven's well equipped apartment. After a couple of days we settled in and almost felt like we lived in Berlin. The apartment is very close to a U station (note no escalator or lift at this station if you have heavy luggage), and a walk of around 20 mins to Museum Island. The apartment is warm even without heating on, and really light which is great in the grey of winter. There is relevant and easy to follow information in the apartment.