I have stayed at Christiana's place several times in the course of a couple of years and have greatly appreciated the impeccable service - always very clean, easy to get in and out, very responsive and helpful host. The place has an air-conditioning, which is a rarity in Vienna and can save you during hot summer days. The neighborhood is one of the trendiest in Vienna, with lots of places to shop and eat, and still within walking distance from the centre.