We enjoyed our stay at Michael's apartment. The floors felt sparkling clean (which is a good indicator of the rest of the place), the beds were comfortable (but could do with some better pillows) and the living spaces huge and spacious.
The kitchen equipment could be better and please get a toaster.
The washer was so useful. So great you also have a drying rack (why doesn't everyone who provides a washer also provide somewhere to dry your clothes?!?!?). A dryer would be good for the wetter and cooler months.
The weather in Vienna was hot during our stay. It was such a relief to open the windows of the apartment but we could not sleep with the street facing windows open due to the sound of traffic and the people talking in the street. Perhaps a portable air con could be available in the summer.
With these changes, I would definitely give a 5-star rating.
Michael is a great host who was super easy to deal with.