Bella's Homestay near Gyeonridan
It's got a very cute interior and I like that it seems like a speakeasy. It's between Taco Taco Chili Chili and Istanbul on the street towards Gyeonridan. It's got sandwiches, coffee, and alcohol on the menu and the interior has lots of kitschy things.
There are rustic cakes and cookies that look homemade and also a coffee maker. I didn't happen to get anything on this day, but the menu looked like it had Korean cafe fare (Ramen, Fried Rice) along with other things such as ham sandwiches. The prices are average: an Americano for 5,000 and sandwiches for 6,000. I'll have to stop in next time for a treat.