Valerie is a nice good host. Alice and I had strange check-in and check-out time but it wasn't a problem for her at all. She replies quickly if you have any question, she gives you info about the city. She also printed our flight tickets (thank you for the favor). The apartment is nice, well-cleaned and cozy with all services needed for a short stay in Vienna. Great position, about 5 mins to Karlsplatz metro station and about 10 mins by walking to the main attractions in the center. You will enjoy your stay there.