I highly recommend the Nusswaldgasse apartment. District 19 is a very quiet, comfortable area with beautiful homes and buildings and the immediate neighborhood has good restaurants and grocery stores. The stop for tram 37 is only a few blocks away and it will take you directly to the outskirts of the inner stadt, from which everything you may want to see is a walkable distance. The apartment itself was very clean and comfortable, with a spacious kitchen and living room, and the garden is a lovely place to enjoy a meal or a chat. Harriet was a very caring host and made sure we had everything we could need. When we return to Wien, we hope to be able to stay at Nusswaldgasse again. Thanks for everything, Harriet!