Nikolai's apartment stands close to the stop of the train coming form Schonefeld airport which helped us enjoying at most the weekend we spent in Berlin.
The neighbourhood itself is a really pleasant place full of little shops, international restaurants (we loved the Vietnamese ones!), overall safe and easy to walk.
We love walking so we did not use any mean of transportation because we found the apartment at a comfortable distance by everthing we planned (or not) to see. But in case you don't like exercise well the tram stop is just in front of the entrance.
Nikolai was nice and careful and we appreciated his kindness in storing our suitcase and letting us enjoy till the very end the holiday.