I knew I had to come back here when I randomly walked by once: Even from the outside, this cafe looks incredibly charming, radiating hospitality out into a quiet cobblestone street in the 8th district. Not unlike the Creperie in nearby Schlösselgasse, they serve a large variety of crepes, galettes and waffles – only here they're made from buckwheat and soya milk, and are a bit more expensive. They also have a huge selection of teas. The staff is very friendly, and there's a whole library of books to browse or buy.
Highly recommended.