Excellent location, quiet street and Michael is very quick to respond to any queries and help out. The bedroom is well-lit and the mattress very comfortable - you get a good night's sleep. Heating is fine. There were no noisy neighbours and the people I met in the building seemed perfectly nice. The neighbourhood is quiet but close to public transport facilities. There is a Billa supermarket about 100 metres away.
I would highly recommend this if you want a decent, great value flat in a good part of Vienna. Note, there is no elevator so you do need to be happy walking up the stairs.