This is about as good a location as you can get! Just a few steps from Plaza del Sol. The apartment is clean, quiet, and had a comfortable bed. We felt very safe, even when we were getting in after a late night dinner. It was great to have use of the washing machine, as I had already been on the road for over a week. Like most European homes, there wasn’t a dryer, but our clothes dried overnight on the large drying rack that was stashed behind the couch.
The apartment, as described, is small. That was fine for us, but might bother some.