The apartment is beautiful and very nice. It was very clean and everything new in it. The situation is excellent, in the heart of Vienna and very close to the main train station.
We stayed there for 12 days on our honeymoon with our 5 months old daughter. They arranged a crib and a high chair which was nice. However, the apartment is on the 2nd floor and quite difficult to take the stroller up and down.
The self-service check in was very efficient.
Overall we highly recommend this apartment. They have a couple of more apartments in the same building if you want better access for an example a wheelchair. They reply to you very fast so it is good to check what apartment suits your needs before booking.