The calculated distance (air line) between Prenzlauer Berg and Alt-Treptow is approximately 4 miles respectively 6 kilometers.
By car or train, the actual journey to Alt-Treptow is certainly longer, as only the direct route (as the crow flies) between Prenzlauer Berg and Alt-Treptow has been calculated here.
Air line (approximately)
6 kilometers
3 nautical miles