Can't say I'm a fan. St. Nicholas, yes THE Nicholas of Xmas fame is supposedly buried here. Overall the church does not have enough to convince me of outstanding value. The one round ceiling fresco is pretty good but many of the others are hard to make out. I paid extra for the audio guide and the explanation is the usual religion theme and motif, I have seen those many times in many churches. The guide also focuses a lot on the buried (supposedly, remember) people and their backgrounds, nothing that is of interest for the physical church present now. Lastly, the church is in bad condition due to rains and floods, you'll be required to watch out for puddles if it rained recently. While I don't mind the stopover to see something else I can't recommend adding it to your itinerary simply because it's on the tentative list.