The house is unusual because it is composed of two houses (hence its double name - the V. K. Hauger House - the A. S. Zalshupin Income House).

This is easy to notice - the floors are at different heights - the windows on the right side are higher than those on the left, and the apartment numbers are divided between the two houses - odd numbers in one, even numbers in the other.

In 1909, the owner of the house became Alexander (Abram) Semenovich Zalshupin. According to the design by M. I. Segal, the house was extended by two floors and became six stories tall. Above the facades, in the spirit of "pure" eclecticism, an addition was made in the forms of "pure" Art Nouveau. Honestly, such a project is striking in its incoherence and causes bewilderment. However, Segal later revised the project, and now the facades represent a coherent work of the Art Nouveau style.

Mayakovsky lived here from 1915 to 1918. Living here in a spacious room on the 5th floor, it had the appearance of a temporary refuge. Necessary furniture, a sofa, and in the space between the windows - a writing desk. His room was a kind of club where the poet’s friends held late-night discussions about contemporary art, its role, and purpose. Here Mayakovsky wrote the poems "Flute-Spine," "War and Peace," "Man," "Mystery-Buff," "A Cloud in Trousers," and "Man," collaborated with the magazine "New Satirikon," and actively participated in the revolutionary events he witnessed at that time.

Mayakovsky lived in Moscow, and visited Petersburg-Petrograd occasionally, performing his poems before the public. He first came to Petersburg in the autumn of 1912. Most often he performed at the "Stray Dog" on Italian Street and at the Trinity Theater on Trinity Street (now Rubinstein Street). The only permanent place where the futurist poet lived was an apartment on Nadezhdinskaya Street, where he rented a room from the stenographer M. V. Maslennikova.

Here, in the summer of 1915, he met and soon became very close with Lilya and Osip Brik. They then lived nearby, on Zhukovsky Street, house 7. He was brought there by his friend, Lilya’s sister Elsa Kagan. And he loved Lilya for his entire short life. In this room, he even tried to shoot himself a year after their meeting, but the pistol misfired. Mayakovsky shot himself in Moscow in 1930. He is buried there as well.

This room, as remembered by the Moscow writer Sergey Spassky, "had the appearance of a temporary refuge, like most of Mayakovsky’s dwellings. Necessary, owner-independent neat furniture: a sofa, and in the space between the windows – a writing desk. No books, no scattered manuscripts – these signs of settled writing. But it was supposed to look like that," Spassky adds, "Mayakovsky 'wrote' in his head. Finished poems were transferred to paper."

His room was a kind of club where the poet’s friends held late-night discussions about contemporary art, its role, and purpose. Here Mayakovsky wrote the poems "Flute-Spine," "War and Peace," "Man," as well as "Mystery-Buff."

In April 1940, on the tenth anniversary of the poet’s death, a memorial plaque to Mayakovsky was installed on the right side of the house.

Sources:

https://www.citywalls.ru/house2229.html

https://alfa-delta.livejournal.com/143525.html

https://www.sobaka.ru/city/city/112373