I strongly reccomend this apartment. Everything as described.
Clean, nice furniture, wonderful shower, wi-fi works very well.
Very close to the subway (Schottenring on purple line, choose exit Herminengasse). 15 min walking and you are in the historical city centre.
Ari is a great host, perfect organization and great tips.
We didn't met him but we never had the feeling to be "alone", just write a message or phone and you'll have all the support you asking for.