So this is how they introduced themselves in their blog:
we're a laidback little store + coffee shop selling a nicely curated selection of books, independent publications, records, t-shirts, stationery, home goods and other wonderful creative goods in Singapore. we're also the organizer of small, fun & meaningful exhibitions, live shows, classes and other events. 
This place is located in a shophouse along New Bridge Rd.
It's on the 3rd level and the staircase leading to Casual Poet is long and steep, you'll need a bit of stamina to get up there.
And for the book lovers, you'll love the books you can find here.
The quiet and relaxing environment makes it perfect a place for you to spend some quality time with your books :)
Or if you just want to catch up with your friends, you can have a good chat over some coffee & tea.
Otherwise, you can engage in some anti-social mind boggling activity like - playing Chinese Chess :p
Really nice a place :)
Oh, and i love the shop name - Casual Poet.