Polish architect Jakub Szczesny decided to convert an alley which was used for garbage into a 4-foot-wide home in Warsaw claiming that it’s the world’s narrowest house.

Five years ago, he and Israeli writer Etgar Keret started designing the two-story apartment in Warsaw’s historic Jewish neighborhood, as New York Post says.

The apartment features a foldout twin bed, a desk, a mini kitchen and bathroom.

They opened the space in 2012 as an artist’s retreat and named it “Keret House.”

“I started to think who could live there,” Szczesny told Dezeen magazine. “It had to be a person that would like to be a hermit. Someone who would like to spend time alone doing something, but doing what?”

The house has been used to host artists for up to 21 days at a time and so far, architect Yuri Avvakumov and journalist Irad Ben Isaak have made it their temporary home.

“It requires a sense of humor,” Szczesny continued, “as you cannot stay long in a place like this.”