Rubén's place is really nice, perfect size for a couple or 3-4 travelers and very nicely furnished. Location is great, modern (and a bit windy :) ) neighborhood a few metro stops away from the city center. The metro and shops are nearby. The building is very nice too, equipped with a top quality gym and great saunas. We were there during Christmas, so couldn't really use the balcony, but must be really nice for breakfasts outside when the weather's nicer. Highly recommended for a modern, comfortable Vienna accommodation!