My stay at Astrid's apartment was absolutey perfect. Astrid is lovely and the apartment itself has a beautiful, homey, artistic feel to it. The neighbourhood is great, pretty much everything you need is within a short walking distance, including an outdoor market a few blocks away. Don't miss the lovely bookstore a block and half down the street! As for the general location... I bought a travel pass for public transport but I barely used it, almost everything I wanted to see was within walking distance, but if you're not much of a walker the public transport in Vienna is top notch and super easy to navigate. I have never felt so safe and at home in a city in my life, and I can't imagine a better start to my vacation! I'm in Budapest now and dreaming of the day I can come back to Vienna. I would 100% stay at Astrid's place again, I recommend her place and the city wholeheartedly.