This is a great location in Madrid! It is close to the train station, a metro station (definitely buy the metro pass - very convenient and inexpensive), and the “golden triangle” of museums. It is not exactly the hip and central part of town with the bars, restaurants, and clubs, but that wasn’t necessarily our main requirement.
The apt was clean and had all the essentials (no extra frills). It is compact and is good for two people. You can move the two twin beds apart if you want more space.
And the hosts were very responsive and attentive!