I stayed in Carina & Georg's apartment for one week to visit the nearby State Archives and I thoroughly enjoyed it! The apartment is wonderful: cosy, clean, nicely decorated, with great WIFI and equipped with all amenities you could possibly wish for. It is located in a quiet neighbourhood, with some nearby restaurants and supermarkets. It also has a metrostation very close by, so you can easily reach the city center. I did not meet Carina or Georg in person, but they responded to e-mails very quickly and were really kind and helpful. They had also prepared a folder with all kinds of interesting info about the neighbourhood. I will definitely stay here again next time I am in Vienna and would highly recommend the apartment to everyone.