i love the first floor and especially the old couches and armchairs - something thats too rare in viennese cafes i think. it creates a real laid back atmosphere and looks much better than any lounge-cafe/bar with it's all too fancy - new - con-tem-po-rary de-sign style.
plus the ronahi has a good assortment of various coffee as well as delicious - mike mentioned it - mediterranean food.
the only thing i dislike are (quite new) the opening hours, starting from 5 pm to sometime during the week (i don't know it for the weekends). that's a little restricting.
i didn't know that they've got DR PEPPER. man, i gotta go there soon again keeping this most important information in mind!