Ingela was a great host even before we arrived in Vienna, sending us very detailed instructions on how to get to the apartment building and into the building, not just from the closest Metro stop, but from the point we arrived in Vienna (bus station).
The apartment is not in the city center, but we did not find this an issue because it's a few mins walk away from the Metro. The apartment is great...it's clean, well-equipped and has a big but cozy living room.
We had some problems with wifi the first half of our stay, but this was resolved after an SMS to Ingela.
The apartment building has an elevator, so this was truly a lifesaver because we had large suitcases. It wasn't working when we were leaving, but a quick call to Ingela and it was fixed in less than 10mins.
It is so convenient that Ingela has multiple apartments in the same building, so she can offer you anything you need, whether you have a large or small group. Even better if you have a large group and all want to stay together in the same building.