The hostal was a very low budget place.
There is not always someone on duty. In fact, there is rarely anyone on duty.
For full review see this link
and then to Puerta del Sol.
I remember Puerta del Sol as much larger than it appeared in my visit. It was the center of most of our travels in Madrid in those old days.
The GPS on the phone could not seem to get me to Sol, and finally I asked someone.
After he called, I walked out again and circled Tirso de Molino. There were large groups of Black men with large bundles wrapped in blankets. Perhaps they were a soccer team.
Also, there were a dozen or so young men with black shirts and "today" and "tomorrow" written on them with a drawing under "today" of a group of men and one under "tomorrow" with a bride and groom. I wondered what that was about. Frank supposed it was a bachelor party.