The apartment was very cute and clean, the amenities were as described, and the hosts were generally very responsive. The location was the best part and nearly all of the main sights were within walking distance, or a very quick Uber or bike ride away. The Karlsplatz station is 5 minutes by walking, and it connects you to many public transport lines as well. However, during our visit, it was stifling hot in Vienna and the one fan in the room was not really strong enough to circulate the air, so it was rather uncomfortably warm and difficult to sleep, especially after long exhausting days sightseeing in the heat. One of us got a lot of bug bites (including 8 in a cluster on one arm), perhaps because we had to keep the window open at night. The climate is not the hosts' fault obviously, but the lack of a/c is something to keep in mind for the hot summer months (just be mentally prepared for it, I suppose).