In one word: perfect. Max is a very friendly and highly communicative host. He has many recommendatioms for local cuisine and activities, many of which we used and enjoyed.
The apartment is located a few minutes away from metro and trams which allow fast access to Vienna's center. The apartment is very large, clean and accessorized. The heating is great and hot water runs in the shower 24/7.
I would highly recommend Max and the apartment for any couple visiting Vienna.