I visited this WHS this Summer 2012. It can only be viewed from the outside as it is a private residence. The main entrance is being restored but the rest of the site is in a very good shape. It looks quite strange and unpleasant to the eye at first but it was built this way on purpose to deter passers-by from the artistic treasures it houses inside. The fact that it was inscribed as a WHS prevented the owners from altering or demolishing the whole site to sell the land for some multi-storey building or yet another embassy to be built. It is truly unique and hopefully in the near future the owners will decide to open parts of this WHS to the public.