I spent 2 days at Irma's flat. First, she is a very kind host and accommodating. It was very easy to communicate with her before and during the stay. The room is simple but perfect, with everything you need and a comfortable bed. The whole flat is very clean and huge. The part for guests is separate from where Irma lives, so it's almost as if you have your own flat.
It looked to me this area in one of the best parts of town to stay as you are very close to the touristic centre but you get the feeling of a cool residential neighbourhood of Vienna.
The view from the rooftop terrasse is amazing.
I would recommend to stay at Irma's.