I had an awesome time in Vienna in the flat of Natalie and Paul. I stayed there for 4 weeks and had no problems at all during that time. Natalie and Paul are extremely friendly and helpful people and make you feel comfortable from the first minute. The flat itself is very nice with a large living room, tidy kitchen, well equipped bathroom and a cute room for yourself. The bed is super comfy and you can enjoy your privacy to the fullest if you want, but as mentioned earlier, Natalie and Paul are very nice people who can help you with your plans in Vienna. You can go grocery shopping and reach the underground with a walk of round about 3 minutes, so the location is near perfect.
I would definetly highly recommend this location for a short or even long-term stay in vienna.