Ludwig's apartment is truly 5-star! The location is perfect (walking distance to all major sights in the Inner Ring of Vienna, and about 3 blocks to the U-Bahn station), and Ludwig made every effort to ensure that our stay was comfortable. There is an air conditioning unit in the living room, but since it was hot in Vienna during our stay, he added an additional mobile unit to the bedroom, which made it very comfortable. The apartment is spacious, very clean, in an very quiet and secure building. We stayed with our baby, and he accommodated us with everything we needed to feel at home (high chair, crib, baby cooker, etc). His communication was extremely prompt, and he even assisted us with everything we needed to know about parking. We would absolutely stay here again, and would recommend it to anyone visiting Vienna!