Nice little apartment in a great location!
My daughter and me stayed at Kai's place for a week to explore Vienna. The location is the best, close to restaurants and groceries, Kenny's food on the street level of the house is great (Hawaian/Asian/Vegan bowls, coffee, smoothies, etc.), close to the inner city area with all the sightseeing points, around the block from the Karlskirche (we enjoyed the four season concert). Everything you need for a few days stay is there, communication with the hosts is great, we highly recommend Kai's place!