Andriyivskyy Descent (or Andriyivskyy Spusk as it is called locally) is a popular destination for souvenir shopping. The historic brick street starts near Kontraktova Square and winds up the steep hill to Saint Andrew's Church at the top. If the gate at the bottom of the steps is open you can visit the church. A great view can be obtained from the area directly behind the church, though unfortunately it seems likes it's always blocked off these days.
The cache is a grey magnetic nano about 2m up the pole on the side towards the kiosks and sidewalk. You can find an opening between the kiosks on the SE side to enter where the pole is. Be careful where you step though; the place may not be the cleanest, but unfortunately places to put a container near the church are limited.
After logging the cache be sure to enjoy the view of the church up close.