My partner and I had a great time at Steven's place. The apartment is beautiful, clean, tidy, comfortable and well situated: lots of secondhand shops, nice cafés and good restaurants in the area. The Museum Quartier and Ring area are a half-hour walk away, several U-bahn, tram and City Bike stations are close.
The room is huge and there's a fan (which is really really nice when it's 40°C 👍🏻)
We met Steven's flatmate, Sidonie, who was super nice to us and gave us lots of useful recommendations and tips for visiting the city.
We strongly recommend staying at Steven and Sidonie's place for a great, live-like-the-locals experience in Vienna.