I was a little confused about the Chocolaterie aspect because all I saw offered were some small cakes, which seemed only marginally chocolatey. I was told that they normally have selection, but not the day of my visit.
The coffee is average, but they don’t claim to be a cafe or bar. The focus seems to be on the books and providing a space to brows and enjoy. They also have a limited selection of English language books.
Papercake is split level, so you can chill out upstairs in the loft, which has plenty of couches and nooks.
I liked the eclectic collection of furniture, like the wake board table supported by the legs of an ironing board and other decorative elements. Many places in Sofia are becoming rather homogenized by frequently utilizing a similar design style, this unpretentious and laid back environment is conducive to sipping a coffee and typing away on an iPhone writing a blog post.