The Stairwell of the Evil Apartment

Since the 1980s the stairwell of Bulgakov's / Berlioz's / Woland's apartment has become a major attraction and a locus of impromptu graffiti-writing. Some images you can see below:

see the cat?

presumably this is Margarita...

"HET" on the locked courtyard door, 1998

two more cats on an outer wall

 More graffiti from the apartment