Arrival and Departure:
If by car (as here) then I recommend the parking garage "Podzemní Parkoviště Letná" for a cheap 150 czk a day. (Marked as B in Route).From there you walk through the Letna Park to the metronome landmark and enjoy the wonderful view. (Official start of this route)Alternatively: The route by public transport, there I recommend the station "Čechův most". There, you start at the bottom of the bridge and then go up the stairs to Letna Park, the landmark metronomist. There you can directly enjoy the view.