We spent lots of time in this lovely spot because it was raining in Vienna for our two night stay. We really enjoyed it. We had a very easy time checking in, and actually really liked that we could self check in. Bernhard sent us an email with detailed instructions and double checked that we got it a couple days before our stay. He was also extremely responsive when we had questions. He dropped off an adapter for us when we asked if the apartment had one. It was very nice.
The location is great, next to the train station. The apartment is a bit smaller than it seems in the pictures - but they are accurate. We felt that we couldn't fault Bernhard for just having really good pictures taken :)
If you want an Airbnb experience with a hotel feel - we had fresh towels and slippers :), privacy, and lots of light than this is a great spot for you.