Daisy's apartment is located fairly conveniently, a few minutes walk from Westbahnof station from where you can reach all major attractions by train or tram in 10-15 minutes. The airport bus line 1 also starts from Westbahnof and there are luggage lockers at the station so these are plus points.
The apartment was very neat, clean and spacious. There is also a washing machine for clothes which we did not use but think will be helpful for people who stay longer.
We were in Vienna for only 1 night but will surely come back and would love to stay here again. Thanks Daisy for hosting us!