Managed to get up this tower in our last day.
Tickets were cheap (think it came to about £7 for 1 adult and 1 student to go up)
Views were very good at the top, practically a 360 view. However sadly you can’t go out onto the balcony at the top, I assume because the fence is too low.
Great information inside about the history of krakow, worth a visit if you can handle lots of uneven stairs!