I visited this WHS in Summer 2019. It has become popular as a nerdy site to visit among WH Travellers (along other sites such as the Pile Dwellings, Iberian Rock Art Sites, Struve, etc.). Moreover, unlike the other WHS mentioned, it's just one tiny location not a series of locations!
It really is an idyllic place with an intact layout, reminding me of Gammelstad, Sweden but also several other tiny Czech villages I drove through during my road trip. It is yet another WHS in Czechia which can be thoroughly seen in much less than an hour. It lacks any OUV but it's a convenient stopover when travelling from Telc (or elsewhere) to Cesky Krumlov. The rural museum in the square doesn't add anything special to one's visit. There is a marble UNESCO sign on the rear wall of the village bakery and a UNESCO WH inscription pillar just in front of it.
What I'll definitely remember from my visit are the freshly baked Holasovicke kolache (blueberry/raspberry and cheese pastries) and a good tasting of different Budvar Budweisers (photo).