Vienna Calling is in a quiet area of town but the inner city is very close and accessible. The apartment is immaculate, with everything you need to enjoy your stay, including books, maps, and food/drink (free Nespresso, yogurt, fruit and water). We didn't meet Leon but he was very flexible with our arrival and departure times, and he was kind enough to leave maps, books and suggested walking tours. I hope to return and would highly recommend staying at this apartment if you are visiting Vienna!