… the best way to get there is via Heiligenstadt station (U4). From there, please use bus line 38A to the bus stop “Cobenzl Parkplatz”. You will get there in about 20 minutes, and thus you are less than 100 metres away from the Weitsicht.
… the fastest access from Döbling, Grinzing or Heiligenstadt to the Cobenzl car park is via Höhenstraße. There you can park your car free of charge and will reach the Weitsicht after only a few steps.