Hotel Royal is located right at the main square, just around from St. Stephen's Cathedral, and a few steps from a main metro station, which was extremely convenient.
The staff were very lovely as well. We arrived very very early in the morning, well before check in time, so our room was not ready.
We were able to leave our bags, while we set out on an all-day trip out of Vienna. We did ask that our bags be taken up to our room when it was ready, and were assured that it would be. Unfortunately, that wasn't the case when we got back very late that day, to clean up and head out for dinner. We got back very late that evening, got to our rooms, only to find that our bags were not there. After finding out bags, getting them to be brought to our room, cleaning up and changing into fresh clothes, most restaurants were already closing up, so our dinner plans got a bit ruined.
Because of the location and the friendly staff, I would stay at the hotel again.