The host is really friendly and helped us out with advice and recommendations on train tickets, activities and sights to see, which really helped out.
The appartement is close to the city centre, especially if you purchase a public transport ticket (which I would definitely recommend as the pt is really well organized).
The appartement was really clean and spacious. All thinkable facilities were available (microwave, oven, towels and even a filled shower gel and soap dispenser).
All in all I would definitely recommend this apartment if you want to explore and experience Wien/ Vienna in a comfortable and convinient fashion.