Bulgakov

One unusually hot spring day in Moscow, in during the hour of sunset at the Patriarch's Ponds, there were two citizens. The first of them, dressed in a pair of greyish summer pants(?), was short, well-fed, bald, its  was carrying a decent pork pie hat in his hand. and On the well-shaven face his supernatural size glasses were placed in a black horn-rimmed glasses. The second - a broad-shouldered, red-haired, shaggy (shabby(?)) young man with his head cocked to the (under a(?)) checkered cap - was a cowboy, chewing wearing white pants and black sneakers.

The first was none other than Mikhail Alexandrovich Berlioz, chairman of one of the biggest Moscow literary associations, with the abbreviation nick-name Massolit, the and editor of an thick art magazine. and His young companion was a poet Ivan Ponyri, writing under the pseudonym of homelessness.

as the title of a book?

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It sounds kind of poetic. I tried not to remove all of that.

Sunset doesn't exactly last an hour, and "at the hour of" as a phrase is very antiquated. I also tried to resist, but I really need to move the "unusually hot" to modify the day. It kills the poetry of the first line, but makes it also correct. 

The use of "citizens" is odd, but I'm leaving it because it seems stylistic. 

I think something cannot be "supernaturally" sized. Also, you can't have glasses inside of glasses. Maybe you meant lenses inside of frames? 

Shaggy doesn't really describe things besides hair, carpet and maybe clothing. 

If you cock your head "to" something, you tilt it in that direction. So, I picked that you meant it was cocked while he was wearing a checkered cap. 

I really hope he was wearing those pants, not chewing them. 

Abbreviation doesn't quite work for names of people. So, I picked "nick name". Unless you mean "pseudonym". 

Not sure what you mean by "thick" here with art magazine. 

I split up the last sentence because it was too long. 

As much as I like the sound of "writing under the pseudonym of homelessness", it doesn't make sense. Maybe you're translating something literally to English? If so, perhaps say 

writing under the pseudonym [insert pseudonym here], which means "homelessness".

The last fragment made no sense so I scratched it out.