The apartment is indeed very good. It's comfy, warm, clean and quiet. You have all the amenities you need. I'd like to specifically point out very good design of the space - it makes staying there just that bit special.
The house is near important public transport links, so getting to the sights is very easy and quick. Jan-Eric is a great host when it comes to advice, he gave as a good tip on a nearby museum and also told us the best ways to get around Vienna from the neighbourhood. All in all, a great stay.