What a stunning view! Honestly you can't go wrong with any panoramic view of Prague, it's such a…read morepicturesque city!
This tower was built in 1891, a 63.5 meter version of the Eiffel Tower, located centrally in Petrin Gardens which is a large park area directly south of the Prague Castle plateau (the closest section of the park being only 5 minutes away by foot). The tower itself is about a 30 minute walk from the castle, with some gentle slopes, not too steep. It's helpful to download G-maps in advance as cell signal can get weak in certain areas. There are also a number of different trails so better to be prepared and save yourself some extra wandering, though with the number of periodic signs and other visitors you shouldn't get too lost.
If you're approaching the hill from the east, there's funicular that takes you uphill from the lower section of the city though when I was there this was under repair, (that might've been why the tower wasn't so crowded too?)
Timed tickets are available to purchase in advance and this is recommended during peak tourist season. Prices vary depending if you purchase in-person or ascend the tower by stairs or elevator. 220CZK purchased at the tower in person, 290CZK for online ticket. 150CZK for use of the elevator.
In mid-autumn on a weekday evening around 5:30pm the crowd was pretty thinned out (maybe bc the funicular was down). I think there were 2-3 parties in line when I purchased my ticket at the counter inside the entrance. Thankfully the staff was friendly and spoke much better English than I had any clue about Czech, the transaction was smooth, and up the stairs I went!
The climb up wasn't bad, a mini workout of 299 steps with a good-sized middle platform to rest if you like and admire the views from an outdoor observation deck. The top level is an enclosed area with 360 degree views. Winding around the center of the tower is a double helix staircase; one staircase goes up, the other down. They're strict in enforcement. Also the stairs are partially covered though partially open to the elements so in the case of inclement weather be wary.
Once you're on the middle and top decks, the views are stupendous! On a partially sunny late evening you could see for miiiles.
Bathrooms are not located in the tower so if you need the closest ones are paid about 25CZK (€1), only exact change accepted.