Our stay at Sis's place was wonderful. She was very attentive and went above and beyond to ensure our needs were always met. She also made us feel as if we were visiting an old friend, which was nice considering we didn't know anyone in Vienna. The apartment is truly charming - spacious, clean and cozy, located in a lovely part of town close to plenty of great stores and restaurants, public transit, and the excellent Naschmarkt. Ideal for families with young kids such as ours. Would definitely stay there again and recommend it to all friends!