Location is great, bedroom is quite spacious and host is super kind and fast at responding. I did struggle a bit with the door, but Dan was awesome at being my troubleshooter.
Please be aware that the bathroom, and particularly the sink is tiny. This makes it difficult to brush teeth and wash face without resulting in a puddle on the floor.
If you can live with that, then I would say go for it as you’re within walking distance to the subway, and to many attractions in Vienna!