Maybe you’re a student at Columbia or maybe you’re a freelancer who lives in Harlem, and you don’t necessarily want to spend all day at home. If you’re either of those things, you should know about Double Dutch. It’s a coffee shop near Morningside Park, and it has a lot of things going for it. There’s free wifi, plenty of seating, a few different sandwiches, and - most importantly - a back patio. If it’s nice out, sit out there and get some work done.