It's a long time since I've read him, but what a writer. His book of children's stories called
The Fools of Chelm was a sweet read for me and the kids. The people have great names like Dopey Leikish and Treitel Fool and they spend lots of time figuring out how to solve their "problems".
His stories for adults are wonderful too. I like the shorter ones best, so the collections are what I can recommend. Try
The Spinoza of Market Street. His longer novels are kind of epic - well, covering a couple, two, three generations. I don't remember them as well.
Anyhow, he wrote his best work about a Warsaw that once was, through the eyes of a child.