Stayed here during a work conference. Markus and Pia were very helpful and quick to respond. We were able to check-in early as the room was ready when we arrived.
The apartment is close to the Nestroyplatz and another underground station that I can’t remember the name of right now. It was conveniently located halfway in between our conference centre and the Innerstadt, which was only 10 minutes away on foot.
The space itself is very nice and modern with great light. Small touches were nice such as the power bar that included USB ports for charging my electronics.
Overall, I would highly recommmend this place.