Mikhail Bulgakov, the author of The Master and Margarita, is hailed as one of 20th-century Russia’s most important writers. It all started in 1921, in a small room in one of Kiev’s overcrowded communal apartments. The dingy space, known as the “Odd Flat,” inspired Bulgakov’s Psalm, Moonshine Lake, and Zoyka’s Apartment. The writer was only 48 when he died in 1940, and his apartment—number 50 on 10 Bolshaya Sadovaya Street—was converted into a state museum in his honor. This mostly visual virtual tour takes you through it. —E.C.