I consider Varamo (comedic) and Episode in the Life of a Landscape Painter (tragic) to be standouts among the half-dozen Aira books I've read in English. I imagine a good deal is lost in translation.
There's a certain absurd, freewheeling alchemy to his works, but as tends to be the case with improvisation, they're somewhat hit or miss and require a bit of indulgence on the part of the reader. Luckily, they're mostly novella-length and don't wear out their welcome, so I don't mind giving him my time.
According to the article, he writes in places like McDonald's, which is comical and unsurprising. Likewise that he's an admirer of Raymond Roussel.
I didn't expect that he'd be a Morton Feldman fan, though. His books aren't as methodical, claustrophobic and somber as Feldman's works, but maybe share a similar sense of reflectiveness and focus on small, ephemeral moments.