The description was accurate and it is a great location for getting around Madrid's shopping district. I feel the property is best suited to couples - I think it would be challenge for 4 people - even with small kids. I did not see the square meters mentioned on the listing, but this is a very compact studio apartment - the photos exaggerate the size I think.
We found the extra bedding underneath the mattress, which (to me) was not an obvious place to look - a sign or note would be helpful.
Overall a nice clean apartment in a good location. Recommended.